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anonymous

  • one year ago

What is the inverse of f(x) = 2x − 8?

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  1. anonymous
    • one year ago
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    To find the inverse of a function you are first gonna need to replace f(x) with y. Then you have to flip the x and y variables and solve for y. @sherlocked1270

  2. rishavraj
    • one year ago
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    follow the steps http://www.coolmath.com/algebra/16-inverse-functions/05-how-to-find-the-inverse-of-a-function-01

  3. anonymous
    • one year ago
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    f(x) = 2x − 8 y = 2x − 8 x = 2y − 8 x+8=2y and so on..

  4. anonymous
    • one year ago
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    wait so what do I do after I get to x=2y+1

  5. johnkim2330
    • one year ago
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    you solve for y 2y=x-1 y=(x-1)/2

  6. UsukiDoll
    • one year ago
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    \(\color{blue}{\text{Originally Posted by}}\) @sunleaf01 f(x) = 2x − 8 y = 2x − 8 x = 2y − 8 x+8=2y and so on.. \(\color{blue}{\text{End of Quote}}\) After this step we are supposed to divide 2 throughout the equation.

  7. johnkim2330
    • one year ago
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    can someone help me with my question http://openstudy.com/updates/55a65b2be4b0f93dd7c4162d

  8. anonymous
    • one year ago
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    how do I remove the parentheses from Y=(x-1)/2

  9. rishavraj
    • one year ago
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    how did u get tht??? y = 2x + 8 switch x and y x = 2y + 8 x - 8 = y x/2 - 4 = y now stick inverse notation

  10. UsukiDoll
    • one year ago
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    there's an error. Everything is fine until x+8=2y divide 2 throughout the entire equation to have y by itself the fraction part is correct, but we should have a 4

  11. anonymous
    • one year ago
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    ok I'm going on break see u later

  12. rishavraj
    • one year ago
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    u will get x - 8 = 2y so (x - 8)/2 = y x/2 - 8/2 = y x/2 - 4 = y

  13. johnkim2330
    • one year ago
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    @rishavraj i ony saw sherlocked questin with x=2y+1 haha my bad i didnt see ur guys responses

  14. UsukiDoll
    • one year ago
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    that's alright. mistakes do happen ^^

  15. johnkim2330
    • one year ago
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    and can anyone help with this http://openstudy.com/updates/55a65b2be4b0f93dd7c4162d

  16. anonymous
    • one year ago
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    so u were saying that you have to get rid of the F(x) but in the answers that are provided It has f(x) f^-1(x)=1/2x-8 f^-1(x)=1/2x+4 f^-1(x)=1/2+8 f^-1(x)=2x+16

  17. anonymous
    • one year ago
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    hey

  18. anonymous
    • one year ago
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    hi

  19. rishavraj
    • one year ago
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    see my just previous reply... i ended with y = x/2 + 4 replace y from f^-1(x) so it woud be f^-1(x) = x/2 + 4

  20. anonymous
    • one year ago
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    oh ok thank u :D

  21. rishavraj
    • one year ago
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    u welcome :))))

  22. anonymous
    • one year ago
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    ans is x+8 ------- 2

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