for the function f(x)=x^2-12 find (f^-1)(4)
f(x) = x^2 - 12y = x^2 - 12y + 12 = x^2x = sqrt(y + 12)(f^-1)(x) = sqrt(x + 12)(f^-1)(4) = sqrt(4 + 12) = sqrt(16) = 4(f^-1)(4) = 4
