\(\displaystyle={4}{x}^{{2}}\times{3}{x}^{{3}}+{4}{x}^{{2}}\times{2}{x}^{{2}}+{4}{x}^{{2}}\times{\left(-{5}{x}\right)}+{4}{x}^{{2}}\times{1}\)

\(\displaystyle={12}{x}^{{{2}+{3}}}+{8}{x}^{{{2}+{2}}}-{20}{x}^{{{2}+{1}}}+{4}{x}^{{2}}\)

\(\displaystyle={12}{x}^{{5}}+{8}{x}^{{4}}-{20}{x}^{{3}}+{4}{x}^{{2}}\)