to find the inverse of the function exchange x and y and then solve for y
y = 5 / sqrt (x)
x = 5 / sqrt(y)
multiply by the sqrt(y)
x * sqrt(y) = 5
divide by x
sqrt(y) = 5/x
square both sides
y = (5/x) ^2
y = 25/x^2
The inverse of 5 / sqrt (x) is 25/x^2