Question

What is the inverse of the function f(x) = -5x^2 3, for x>or equal to 0?

Answer 1

f(x) = -5x^2 + 3
y = -5x^2 + 3
5x^2 = 3 - y
x^2 = (3 - y)/5
x = sqrt((3 - y)/5)

Therefore, f^-1(x) = sqrt((3 - x)/5)