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## Katieann16 2 years ago Help me ?):

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1. zordoloom

What's the question?

2. Katieann16

if f(x)=4x-8, what is f^-1(x)?

3. MathDad72

Let's do the same thing we did before.

4. Katieann16

@zordoloom

5. zordoloom

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

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

would it be C?

8. Katieann16

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

No

10. zordoloom

1/4x+(8/4)

11. zordoloom

BTW, thanks for answering my question.

12. zordoloom

It's B

13. Katieann16

No problem

14. Katieann16

thanks for answering mine (:

15. zordoloom

Yep

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