bantu dijawab no 7..............

misalkan x³ + 4 = u
3x² dx = du
x² dx = du/3

x²(x³ + 4)⁴ dx
(x³ + 4)⁴ x² dx
ubah jadi u
u⁴ du/3
(1/3) u⁴ du
integralkan
(1/3) (1 / 4+1) u^(4+1) + C
(1/3) (1/5) u^5 + C
(1/15) u^5 + C
kembalikan u jadi fungsi
(1/15) (x³ + 4)^5 + C