The expression $\displaystyle {\left({4}{x}^{{2}}+{8}{x}+{1}\right)}{\left({2}{x}^{{2}}+{7}{x}+{4}\right)}$ equals $\displaystyle {x}^{{4}}+$ $\displaystyle {x}^{{3}}+$ $\displaystyle {x}^{{2}}+$ $\displaystyle {x}+$