Question

Evaluate:

${\int }_0^3{x}^2+2xdx$

Answer 1

${\int }_0^3{x}^2+2xdx$

By using $\int x^{n}dx=\frac{x^{n+1}}{n+1}+c$

$={\frac{x^3}{3}+x^2|}_0^3$

$=9+9-0-0=18$