soal bab integral , kelas 11 , tolong ya kk' , ada 2 soal itu

Nomor 14
∫ 6x² (x³ + 2)² dx

u = x³ + 2
du = 3x² dx → dx = du / (3x²)
= ∫ 6x² u² [du / (3x²)]
= 2 ∫ u ² du
= 2 (1/3 u³) + C
= 2/3 (x³ + 2)³ + C
Jawaban: C.

Nomor 15
∫ 4 / (4x - 4)⁴ dx = ∫ 4 (4x - 4)⁻⁴ dx

u = 4x - 4
du = 4 dx → dx = du / 4
= 4 ∫ u⁻⁴ (du / 4)
= -1/3 u⁻³ + C
= -1 / [3(4x - 4)³] + C
Jawaban: D