tolong dong no 17 dan 18

Bab Fungsi
Matematika SMA Kelas XI

17] (gof) (x) = g(2x² + 3x - 5) = -11
3(2a² + 3x - 5) - 2 = -11
2x² + 3x - 5 + 3 = 0
2x² + 3x - 2 = 0
(2x - 1) (x + 2) = 0
x = 1/2 atau x = - 2

jawabannya D

18] (fog) (x) = 1
2 sin 2x = 1
sin 2x = 1/2
2x = 30°
x = 30°/2
x = 15°

jawabannya A