The inverse function of the function y = x & # 178; + 1 (x ≥ 0) is sharp

The inverse function of the function y = x & # 178; + 1 (x ≥ 0) is sharp

x^2=y-1
x=±√(y-1)
Because x > = 0, x = √ (Y-1)
That is, the inverse function is y = √ (x-1)