anonymous
  • anonymous
Help me ?):
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
What's the question?
anonymous
  • anonymous
if f(x)=4x-8, what is f^-1(x)?
anonymous
  • anonymous
Let's do the same thing we did before.

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anonymous
  • anonymous
anonymous
  • anonymous
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.
anonymous
  • anonymous
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=...........
anonymous
  • anonymous
would it be C?
anonymous
  • anonymous
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
anonymous
  • anonymous
No
anonymous
  • anonymous
1/4x+(8/4)
anonymous
  • anonymous
BTW, thanks for answering my question.
anonymous
  • anonymous
It's B
anonymous
  • anonymous
No problem
anonymous
  • anonymous
thanks for answering mine (:
anonymous
  • anonymous
Yep

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