Find Rx2dA\displaystyle \int\int_{{R}}{x}^{{2}}{d}{A} where R={(x,y)16x2+36y2576}\displaystyle {R}={\left\lbrace{\left({x},{y}\right)}{\mid}{16}{x}^{{2}}+{36}{y}^{{2}}\le{576}\right\rbrace}