Which equation is the inverse of y = x2 - 36?

We find the inverse of equation y=x2-36 by solving for y and replace with variable x. Solving this, we transpose - 36 to opposite side. Equation will now be y+36=x2, then we get the square root of y+36. We now have the missing inverse equation which is f-1 (x) = sqrt (y+36), - sqrt (y+36).