derivative of an inverse help?

Question

1. If f(x) = x^3+x , and a = 10 find (f^-1)'(a) = ?
2. Find (f^-1)'(2) if f(x)=2x^2-3x for x>0

Answer 1

f(x)=x³+x has an inverse, but I do not know how to express it in closed form.

Without an expression for the inverse I cannot tell you how to find the derivative of the inverse.

If you get an answer to this in class, I would appreciate your telling me what it is. Thanks!