jika f(x) = 2x-1 dan (f○g)(x)=-14x+2, nilai dari g(-3)

fog(x) = -14x + 2
f(g(x)) = -14x + 2
2(g(x)) - 1 = -14x + 2
2(g(x)) = -14x + 2 + 1
2(g(x)) = -14x + 3
g(x) = (-14x+3)/2
g(-3) = (-14(-3) + 3)/2
= (42+3) / 2
= 45/2
= 22,5

Kelas 10 Matematika
Bab Fungsi Komposisi

(fog) (x) = -14x + 2
2 g(x) - 1 = -14x + 2
2 g(x) = -14x + 2 + 1
g(x) = (-14x + 3)/2
g(x) = -7x + (3/2)

g(-3) = -7 . (-3) + 1 1/2
g(-3) = 21 + 1 1/2
g(-3) = 22 1/2