x^2-7,x is greater than or equal to 0

y= x^2 -7

f(x) = y

x= f^-1(y)

y+7 =x^2

x= (y+7)^1/2

f^-1(y) =(y+7)^1/2

or

f^-1(x) =( x+7)^1/2

x =0 or x>-7

regarding any explanation please let me know.

sry here

X >-7 or X = -7

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