Verified Answer :

padawan

let y = f(x) = x^2 - 81
y + 81 = x^2
x = sqrt(y + 81)
switch y to x, x to y
y = sqrt(x + 81) = f-1(x)

kaka200255

Answer:

\sqrt{x+81

Step-by-step explanation:

f(x)= x^{2} -81

y=x^{2} -81

x=y^{2}-81

x+81=y^{2}

\sqrt{x+81=y

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