Incorrect. First check to see that each of these is a perfect square trinomial. Remember that $\displaystyle{16}={{4}}^{{2}}\usepackage{cmbright}\Huge\$ and $\displaystyle{25}={{5}}^{{2}}\usepackage{cmbright}\Huge\$ . A trinomial in the form $\displaystyle{{r}}^{{2}}+{2}{r}{s}+{{s}}^{{2}}\usepackage{cmbright}\Huge\$ can be factored as $\displaystyle{{\left({r}+{s}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ . A trinomial in the form $\displaystyle{{r}}^{{2}}-{2}{r}{s}+{{s}}^{{2}}\usepackage{cmbright}\Huge\$ can be factored as $\displaystyle{{\left({r}-{s}\right)}}^{{2}}\usepackage{cmbright}\Huge\$ .