Pop, to two decimal places
[ \int_0^2 (x^2 + 6x + 9) , dx = \left[ \fracx^33 + 3x^2 + 9x \right]_0^2 ] [ = \left( \frac83 + 12 + 18 \right) - 0 = \frac83 + 30 = \frac8 + 903 = \frac983 \approx 32.666 ]
These links are illustrative – you should verify they are active and legal: sumas de riemann ejercicios resueltos pdf