Asked by Sara

Given that g is the inverse function of f, and f (3) = 4 , and f ′(3) =5 , then g′(4) =


-1/5

-3/5

3/5
Answered by Steve
if f(a) = b then g'(b) = 1/f'(a)

Now just plug in your numbers
Answered by Sara
Okay so it is 1/4
Answered by Steve
Huh? Take a look at what I wrote!

f'(3) = 5
f(3) = 4
so, g'(4) = 1/f'(3) = 1/5
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