Selesaikan dengan integral subtitusi: ∫ x^2 (x^3 + 2)^9 dx Pakai cara!

Misal
u = x^3 + 2
du/dx = 3x^2 => dx = du/(3x^2)

∫ x^2 (x^3 + 2)^9 dx
= ∫ x^2 u^9 du/(3x^2)
= ∫ 1/3 u^9 du
= 1/3 . 1/10 u^10 + C
= 1/30 (x^3 + 2)^10 + C