I was just doing a problem in a review book and my answer doesnt match with what the books says. It f(x)=x^3+1 and if f^-1 is the inverse function of f, what is f^-1(4)? I got an answer of 0.02 but the book says it is 1.44. All I did was sub in 4 into the equation, which I get 64, then set that under one...1/64 and get 0.02 as the inverse. How did the book get 1.44?