Diketahui f(x)=x^-6x+5 Tentukan f invers (5) Tentukan x jika f invers (x)=-2

f (x) = x^2 - 6x + 5
y = x^2-- 6x + 5
x^2 -6x = y -5
( x - 3)^2 -9 = y -5
( x -3)^2 = y -5 +9
( x -3)^2 = y +4
( x - 3) = +/_akar (y +4)
x = 3 +/_akar (y +4)
f-1(x) = 3 + akar (x +4) atau
f-1(x) = 3 - akar (x +4)
f-1(5) = 3 + akar (5+4)
f-1(5) = 3 + 3 = 9 atau
f-1(5) = 3-3 = 0