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Katieann16

  • 3 years ago

Help me ?):

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  1. zordoloom
    • 3 years ago
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    What's the question?

  2. Katieann16
    • 3 years ago
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    if f(x)=4x-8, what is f^-1(x)?

  3. MathDad72
    • 3 years ago
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    Let's do the same thing we did before.

  4. Katieann16
    • 3 years ago
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    @zordoloom

  5. zordoloom
    • 3 years ago
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    To find the inverse of any function. You start by replace the x and y variables. So in this case, You have the original function f(x)=4x-8, f(x) is also y So y=4x-8 Start by replacing x with y and y with x So x=4y-8 Now solve the equation for y.

  6. zordoloom
    • 3 years ago
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    So x=4y-8 Subtract the 4y from the right side and left side You have x-4y=-8 now subtract the x from both sides -4y=-x-8 Divide the whole equation by -4 So y=...........

  7. Katieann16
    • 3 years ago
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    would it be C?

  8. Katieann16
    • 3 years ago
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    A) f^-1(x)=1/2x+2 B) f^-1(x)=1/4x+2 C) f^-1(x)=1/2x+4 D) f^-1(x)=1/4x+4

  9. zordoloom
    • 3 years ago
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    No

  10. zordoloom
    • 3 years ago
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    1/4x+(8/4)

  11. zordoloom
    • 3 years ago
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    BTW, thanks for answering my question.

  12. zordoloom
    • 3 years ago
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    It's B

  13. Katieann16
    • 3 years ago
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    No problem

  14. Katieann16
    • 3 years ago
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    thanks for answering mine (:

  15. zordoloom
    • 3 years ago
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    Yep

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