valuate the integral using the following values.

${\displaystyle \underset{2}{\overset{8}{}}}{x}^{3}dx=1,020,{\displaystyle \underset{2}{\overset{8}{}}}xdx=30,{\displaystyle \underset{2}{\overset{8}{}}}dx=6$

${\displaystyle \underset{2}{\overset{8}{}}}-9xdx$