diketahui f(x) = 2x+5 dan g(x) = ⅓ (x-2). nilai (gof)^-1 (-5) = ... a. 5 b. 2 c. -3 d. -7 e. -9 bantuin sekarang juga yaaa plisss...

Kelas 10 Matematika
Bab Fungsi Komposisi

(gof) (x) = g(2x + 5)
(gof) (x) = 1/3 . (2x + 5 - 2)
y = 1/3 . (2x + 3)
3y = 2x + 3
2y = 3x - 3
y = (3x - 3)/2
(gof)⁻¹ (x) = (3x - 3)/2
(gof)⁻¹ (-5) = (3 . (-5) - 3)/2
(gof)⁻¹ (-5) = (-15 - 3)/2
(gof)⁻¹ (-5) = -18/2
(gof)⁻¹ (-5) = -9