diketahui f(x) =x2-x+4 dan (f°g)(x)=3-2x maka nilai dari g(-4) adalah

(fog)(x) = 3 - 2x
f(g(x)) = 3 - 2x
(g(x))^2 - g(x) + 4 = 3 - 2x
(g(x) - 1/2)^2 - 1/4 + 4 = 3 - 2x
(g(x) - 1/2)^2+ 15/4 = 3 - 2x
(g(x) - 1/2)^2 = 3 - 2x - 15/4
(g(x) - 1/2)^2 = -2x - 3/4
(g(x) - 1/2)^2 = (-8x - 3)/4
g(x) - 2 = √((-8x - 3)/4)
g(x) - 2 = √(-8x - 3)/2
g(x) = (√(-8x - 3)/2) + 2
g(x) = (√(-8x - 3) + 4)/2