- #1
aero13
- 2
- 0
Homework Statement
Find (f−1)'(a).
f(x) = 5x^3 + 3x^2 + 5^x + 4, a = 4
Homework Equations
I'm not entirely sure but I assume I have to use d/dx(f-1) = 1/f '(f-1(x))
The Attempt at a Solution
So far I switched y and x. Found dx/dy to be 15y^2 + 6y + 5. Then I switched dx/dy to dy/dx so the answer became 1/15^2 + 6y +5 and I plugged in 4 to get 1/269. But the answer is wrong