Which equation can be simplified to find the inverse of y=2x^2

The question is asking us to find the inverse of the function: f (x) = 2 x^2. The original function is: y = 2 x^2. First we have to interchange x and y and then to solve the function for y. So the 1st step: x = 2 y^2. Then: y^2 = x / 2. Finally we have to take the square root of both sides of equation: y = sqrt (x / 2). Answer: The inverse is: f^ (-1) (x) = sqrt (x / 2)