Question

ajudaa integral x (x+3) ( x + 1) dx

Answer 1

$\int\limits {x(x+3)(x+1)} \, dx \\ \int\limits {x( x^{2}+4x+3)} \, dx \\ \int\limits {( x^{3}+4 x^{2} +3x)} \, dx \\ \frac{ x^{4} }{4} + \frac{ 4x^{3} }{3} + \frac{ 3x^{2} }{2} +C$

Pronto. Simples assim. :D