Question

Question #277a0

Answer 1

According to this Inverse function reference, for a function to be invertible, for any given y there must be one and only one x.

Explanation:

According to this Inverse function reference, for a function to be invertible, for any given y there must be one and only one x.

Except for `x = 0`, `f(x) = 4x^2 - 1` always has two values of x that produce the same value of y, therefore, not invertible.