tìm tích phân (x^2+x)dx

\(\int {\left( {{x^2} + x} \right)} {\rm{d}}x = \int {{x^2}} \;{\rm{d}}x + \int x \;{\rm{d}}x = \frac{{{x^3}}}{3} + \frac{{{x^2}}}{2} + C\).