Question

Tentukan f^-1(-3) jika f(x)=x^2+8x+12

Answer 1

F(x) = x² +8x +12
y = x² +8x +12
x² +8x = y -12
x(x+8) = y -12
x = (y-12)/x+8

f^-1(x) = x-12/x+8
f^-1(-3) = (-3)-12/-3+8
=-15/5
= -3