Bantuin nomor 7 yaa makasih

misal
u = x³+5
du/dx = 3x²
dx = du/3x²

integral 9x² √(x3+5) dx
= integral 9x² u^1/2 du/3x²
= 3 integral u^1/2 du
= 3 * 1/(1+1/2) u^(1+1/2) +C
= 3/(3/2) (x³+5)^3/2 +C
= 2 (x³+5) √(x³+5) +C
Jawabannya E

integral substitusi

langsung

=  (9x²/3x²) (2/3)(x³+5)√(x³+5) + c
= 2(x³+5)√(x³+5) + c