For this problem,y=f(x) = 3x^{2}− 5x− 1

on the domain of all real numbers.

1. Restricty=f(x)to the domain {a≤x} and find the formula for the inverse functionf^{−1}(y).

I found the vertex (5/6, -37/12)

But I am not sure what to do now for the problem. Any help is appreciated, thank you!