Composing two of three given functions to obtain $2^x+1 - 1$Two-to-one functionsComposing Piecewise FunctionsFinding the domain of a fourth-root of an equation with a term to the fourthComposing Even and Odd Functions With FloorsCalculus: Find equation that represents the set of all points that are equidistant from given three points (0,0,0) (2,4,3)(10,8,9)Math newbie here. Need help with functionsLet $A=1,2,3..,9$. How many functions $f : A to A$ so that $(fcirc f)(1) = 2$ and f is onto?Unit decomposition by three continuous functionsIs there a short notation for function composition?Comparing the growth rates of 2 functions

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Composing two of three given functions to obtain $2^x+1 - 1$


Two-to-one functionsComposing Piecewise FunctionsFinding the domain of a fourth-root of an equation with a term to the fourthComposing Even and Odd Functions With FloorsCalculus: Find equation that represents the set of all points that are equidistant from given three points (0,0,0) (2,4,3)(10,8,9)Math newbie here. Need help with functionsLet $A=1,2,3..,9$. How many functions $f : A to A$ so that $(fcirc f)(1) = 2$ and f is onto?Unit decomposition by three continuous functionsIs there a short notation for function composition?Comparing the growth rates of 2 functions













0












$begingroup$


A problem I'm facing involves three given functions. I need to compose two of them to obtain $2^x+1-1$. The three functions I'm allowed to use are



  • $f(x) = 2x-1$

  • $g(x) = 1/x$

  • $h(x) = 2^x$

It would be great if there was a detailed explanation as to how you got the answer too. Thanks!










share|cite|improve this question











$endgroup$











  • $begingroup$
    Is it $$2^x+1-1$$?
    $endgroup$
    – Dr. Sonnhard Graubner
    2 days ago











  • $begingroup$
    Yes, I couldn't format it well.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
    $endgroup$
    – Brevan Ellefsen
    2 days ago











  • $begingroup$
    Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
    $endgroup$
    – Eevee Trainer
    2 days ago















0












$begingroup$


A problem I'm facing involves three given functions. I need to compose two of them to obtain $2^x+1-1$. The three functions I'm allowed to use are



  • $f(x) = 2x-1$

  • $g(x) = 1/x$

  • $h(x) = 2^x$

It would be great if there was a detailed explanation as to how you got the answer too. Thanks!










share|cite|improve this question











$endgroup$











  • $begingroup$
    Is it $$2^x+1-1$$?
    $endgroup$
    – Dr. Sonnhard Graubner
    2 days ago











  • $begingroup$
    Yes, I couldn't format it well.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
    $endgroup$
    – Brevan Ellefsen
    2 days ago











  • $begingroup$
    Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
    $endgroup$
    – Eevee Trainer
    2 days ago













0












0








0





$begingroup$


A problem I'm facing involves three given functions. I need to compose two of them to obtain $2^x+1-1$. The three functions I'm allowed to use are



  • $f(x) = 2x-1$

  • $g(x) = 1/x$

  • $h(x) = 2^x$

It would be great if there was a detailed explanation as to how you got the answer too. Thanks!










share|cite|improve this question











$endgroup$




A problem I'm facing involves three given functions. I need to compose two of them to obtain $2^x+1-1$. The three functions I'm allowed to use are



  • $f(x) = 2x-1$

  • $g(x) = 1/x$

  • $h(x) = 2^x$

It would be great if there was a detailed explanation as to how you got the answer too. Thanks!







algebra-precalculus functions function-and-relation-composition






share|cite|improve this question















share|cite|improve this question













share|cite|improve this question




share|cite|improve this question








edited 2 days ago









Eevee Trainer

7,80721339




7,80721339










asked 2 days ago









V11V11

196




196











  • $begingroup$
    Is it $$2^x+1-1$$?
    $endgroup$
    – Dr. Sonnhard Graubner
    2 days ago











  • $begingroup$
    Yes, I couldn't format it well.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
    $endgroup$
    – Brevan Ellefsen
    2 days ago











  • $begingroup$
    Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
    $endgroup$
    – Eevee Trainer
    2 days ago
















  • $begingroup$
    Is it $$2^x+1-1$$?
    $endgroup$
    – Dr. Sonnhard Graubner
    2 days ago











  • $begingroup$
    Yes, I couldn't format it well.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
    $endgroup$
    – Brevan Ellefsen
    2 days ago











  • $begingroup$
    Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
    $endgroup$
    – V11
    2 days ago










  • $begingroup$
    For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
    $endgroup$
    – Eevee Trainer
    2 days ago















$begingroup$
Is it $$2^x+1-1$$?
$endgroup$
– Dr. Sonnhard Graubner
2 days ago





$begingroup$
Is it $$2^x+1-1$$?
$endgroup$
– Dr. Sonnhard Graubner
2 days ago













$begingroup$
Yes, I couldn't format it well.
$endgroup$
– V11
2 days ago




$begingroup$
Yes, I couldn't format it well.
$endgroup$
– V11
2 days ago












$begingroup$
There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
$endgroup$
– Brevan Ellefsen
2 days ago





$begingroup$
There are three ways to try composing two functions, and 6 ways to try composing all three. If those failed you could try further compositions I suppose, but it's pretty obvious any further compositions will fail. You only need to compose two functions, so just try the three combinations. This is not a homework-solving site, so you need to show some effort and context for your problem.
$endgroup$
– Brevan Ellefsen
2 days ago













$begingroup$
Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
$endgroup$
– V11
2 days ago




$begingroup$
Oh, I was thinking maybe fh(x+1). Is that right? I'm not very sure.
$endgroup$
– V11
2 days ago












$begingroup$
For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
$endgroup$
– Eevee Trainer
2 days ago




$begingroup$
For future reference, here's a MathJax reference - the markup language used to render math text here. math.meta.stackexchange.com/questions/5020/…
$endgroup$
– Eevee Trainer
2 days ago










3 Answers
3






active

oldest

votes


















3












$begingroup$

Hint:



Consider the functions $f$ and $h$. This answer will be more complicated than simply plugging things in, you'll need to make use of some algebraic properties.



In particular, the property that $$a^b a^c = a^b+c$$




Solution:



So, $f(x) = 2x-1, h(x) = 2^x$. We know we want to get two to the something, so we should apply $h$ at some point, and we kind of want a $-1$ to appear at some point, so that's why we choose $f$.



Sadly beyond that stuff like this is largely guess and check (such as other possible functions or the order to apply them); I'll say right off that the right composition is $f circ h$.



This gives us the function composition



$$(fcirc h)(x) = fleft( h(x) right) = 2cdot 2^x - 1$$



We make use of the property I noted earlier: $2cdot 2^x = 2^x+1$. Thus



$$(fcirc h)(x) = 2^x+1 - 1$$






share|cite|improve this answer









$endgroup$




















    0












    $begingroup$

    Here's the detailed explanation as to how to get the answer:



    Compute all applicable compositions, i.e., $f(g(x))$, $g(f(x))$, $f(h(x))$, $h(f(x))$, $g(h(x))$, $h(g(x))$. Then check if any of these equals (or can be simplified to) the desired function of $x$.






    share|cite|improve this answer









    $endgroup$












    • $begingroup$
      We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
      $endgroup$
      – Dr. Sonnhard Graubner
      2 days ago










    • $begingroup$
      @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
      $endgroup$
      – Hagen von Eitzen
      2 days ago



















    0












    $begingroup$

    But $$h(f(x))=2^2x-1,h(g(x))=2^1/x$$ which gives not your solution, so $$f(h(x))$$ leads to your solutions






    share|cite|improve this answer











    $endgroup$












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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      3












      $begingroup$

      Hint:



      Consider the functions $f$ and $h$. This answer will be more complicated than simply plugging things in, you'll need to make use of some algebraic properties.



      In particular, the property that $$a^b a^c = a^b+c$$




      Solution:



      So, $f(x) = 2x-1, h(x) = 2^x$. We know we want to get two to the something, so we should apply $h$ at some point, and we kind of want a $-1$ to appear at some point, so that's why we choose $f$.



      Sadly beyond that stuff like this is largely guess and check (such as other possible functions or the order to apply them); I'll say right off that the right composition is $f circ h$.



      This gives us the function composition



      $$(fcirc h)(x) = fleft( h(x) right) = 2cdot 2^x - 1$$



      We make use of the property I noted earlier: $2cdot 2^x = 2^x+1$. Thus



      $$(fcirc h)(x) = 2^x+1 - 1$$






      share|cite|improve this answer









      $endgroup$

















        3












        $begingroup$

        Hint:



        Consider the functions $f$ and $h$. This answer will be more complicated than simply plugging things in, you'll need to make use of some algebraic properties.



        In particular, the property that $$a^b a^c = a^b+c$$




        Solution:



        So, $f(x) = 2x-1, h(x) = 2^x$. We know we want to get two to the something, so we should apply $h$ at some point, and we kind of want a $-1$ to appear at some point, so that's why we choose $f$.



        Sadly beyond that stuff like this is largely guess and check (such as other possible functions or the order to apply them); I'll say right off that the right composition is $f circ h$.



        This gives us the function composition



        $$(fcirc h)(x) = fleft( h(x) right) = 2cdot 2^x - 1$$



        We make use of the property I noted earlier: $2cdot 2^x = 2^x+1$. Thus



        $$(fcirc h)(x) = 2^x+1 - 1$$






        share|cite|improve this answer









        $endgroup$















          3












          3








          3





          $begingroup$

          Hint:



          Consider the functions $f$ and $h$. This answer will be more complicated than simply plugging things in, you'll need to make use of some algebraic properties.



          In particular, the property that $$a^b a^c = a^b+c$$




          Solution:



          So, $f(x) = 2x-1, h(x) = 2^x$. We know we want to get two to the something, so we should apply $h$ at some point, and we kind of want a $-1$ to appear at some point, so that's why we choose $f$.



          Sadly beyond that stuff like this is largely guess and check (such as other possible functions or the order to apply them); I'll say right off that the right composition is $f circ h$.



          This gives us the function composition



          $$(fcirc h)(x) = fleft( h(x) right) = 2cdot 2^x - 1$$



          We make use of the property I noted earlier: $2cdot 2^x = 2^x+1$. Thus



          $$(fcirc h)(x) = 2^x+1 - 1$$






          share|cite|improve this answer









          $endgroup$



          Hint:



          Consider the functions $f$ and $h$. This answer will be more complicated than simply plugging things in, you'll need to make use of some algebraic properties.



          In particular, the property that $$a^b a^c = a^b+c$$




          Solution:



          So, $f(x) = 2x-1, h(x) = 2^x$. We know we want to get two to the something, so we should apply $h$ at some point, and we kind of want a $-1$ to appear at some point, so that's why we choose $f$.



          Sadly beyond that stuff like this is largely guess and check (such as other possible functions or the order to apply them); I'll say right off that the right composition is $f circ h$.



          This gives us the function composition



          $$(fcirc h)(x) = fleft( h(x) right) = 2cdot 2^x - 1$$



          We make use of the property I noted earlier: $2cdot 2^x = 2^x+1$. Thus



          $$(fcirc h)(x) = 2^x+1 - 1$$







          share|cite|improve this answer












          share|cite|improve this answer



          share|cite|improve this answer










          answered 2 days ago









          Eevee TrainerEevee Trainer

          7,80721339




          7,80721339





















              0












              $begingroup$

              Here's the detailed explanation as to how to get the answer:



              Compute all applicable compositions, i.e., $f(g(x))$, $g(f(x))$, $f(h(x))$, $h(f(x))$, $g(h(x))$, $h(g(x))$. Then check if any of these equals (or can be simplified to) the desired function of $x$.






              share|cite|improve this answer









              $endgroup$












              • $begingroup$
                We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
                $endgroup$
                – Dr. Sonnhard Graubner
                2 days ago










              • $begingroup$
                @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
                $endgroup$
                – Hagen von Eitzen
                2 days ago
















              0












              $begingroup$

              Here's the detailed explanation as to how to get the answer:



              Compute all applicable compositions, i.e., $f(g(x))$, $g(f(x))$, $f(h(x))$, $h(f(x))$, $g(h(x))$, $h(g(x))$. Then check if any of these equals (or can be simplified to) the desired function of $x$.






              share|cite|improve this answer









              $endgroup$












              • $begingroup$
                We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
                $endgroup$
                – Dr. Sonnhard Graubner
                2 days ago










              • $begingroup$
                @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
                $endgroup$
                – Hagen von Eitzen
                2 days ago














              0












              0








              0





              $begingroup$

              Here's the detailed explanation as to how to get the answer:



              Compute all applicable compositions, i.e., $f(g(x))$, $g(f(x))$, $f(h(x))$, $h(f(x))$, $g(h(x))$, $h(g(x))$. Then check if any of these equals (or can be simplified to) the desired function of $x$.






              share|cite|improve this answer









              $endgroup$



              Here's the detailed explanation as to how to get the answer:



              Compute all applicable compositions, i.e., $f(g(x))$, $g(f(x))$, $f(h(x))$, $h(f(x))$, $g(h(x))$, $h(g(x))$. Then check if any of these equals (or can be simplified to) the desired function of $x$.







              share|cite|improve this answer












              share|cite|improve this answer



              share|cite|improve this answer










              answered 2 days ago









              Hagen von EitzenHagen von Eitzen

              282k23272507




              282k23272507











              • $begingroup$
                We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
                $endgroup$
                – Dr. Sonnhard Graubner
                2 days ago










              • $begingroup$
                @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
                $endgroup$
                – Hagen von Eitzen
                2 days ago

















              • $begingroup$
                We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
                $endgroup$
                – Dr. Sonnhard Graubner
                2 days ago










              • $begingroup$
                @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
                $endgroup$
                – Hagen von Eitzen
                2 days ago
















              $begingroup$
              We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
              $endgroup$
              – Dr. Sonnhard Graubner
              2 days ago




              $begingroup$
              We must not compute all these possibilites, since the solution should be $$2^x+1-1$$
              $endgroup$
              – Dr. Sonnhard Graubner
              2 days ago












              $begingroup$
              @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
              $endgroup$
              – Hagen von Eitzen
              2 days ago





              $begingroup$
              @Dr.SonnhardGraubner Of course, we can stop this extremely finite task as soon as we happen to run into a valid solution. -- Of course one could make one's life a lot easier by observing that the desired composition has $0$ in ist range and is defined at $0$, hence $g$ cannot occur in the composition. Moreover, the desired function has negative numbers in its range, which excludes $h$ as outer function. Hence $fcirc h$ is the only candidate, and if we rely on the validity of the problem statement, we can write it down without further testing ...
              $endgroup$
              – Hagen von Eitzen
              2 days ago












              0












              $begingroup$

              But $$h(f(x))=2^2x-1,h(g(x))=2^1/x$$ which gives not your solution, so $$f(h(x))$$ leads to your solutions






              share|cite|improve this answer











              $endgroup$

















                0












                $begingroup$

                But $$h(f(x))=2^2x-1,h(g(x))=2^1/x$$ which gives not your solution, so $$f(h(x))$$ leads to your solutions






                share|cite|improve this answer











                $endgroup$















                  0












                  0








                  0





                  $begingroup$

                  But $$h(f(x))=2^2x-1,h(g(x))=2^1/x$$ which gives not your solution, so $$f(h(x))$$ leads to your solutions






                  share|cite|improve this answer











                  $endgroup$



                  But $$h(f(x))=2^2x-1,h(g(x))=2^1/x$$ which gives not your solution, so $$f(h(x))$$ leads to your solutions







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                  edited 2 days ago

























                  answered 2 days ago









                  Dr. Sonnhard GraubnerDr. Sonnhard Graubner

                  77.7k42866




                  77.7k42866



























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