You found an equivalent expression by pulling out $\displaystyle\sqrt{{4}}\usepackage{cmbright}\Huge\$ from each radical, but this expression will simplify further. Rewrite using $\displaystyle\frac{\sqrt{{a}}}{\sqrt{{b}}}=\sqrt{{\frac{{a}}{{b}}}}\usepackage{cmbright}\Huge\$ and simplify the fraction.