Question

The function f(x) = x^3 + x an inverse. Compute f^-1(0) and f^-1(2). Hint: Do not try to evaluate f^-1 explicitly.

Answer 1

For f^-1(10),
10 = x^3 + x
by quick inspection, x = 2
so f^-1(10) = 2

similarly for f-1(2),
2 = x^3 + x --> x=1
so f^-1(2) = 1

Answer 2

i don't understand what you did