Factor $28=2^{2}\times 7$. Rewrite the square root of the product $\sqrt{2^{2}\times 7}$ as the product of square roots $\sqrt{2^{2}}\sqrt{7}$. Take the square root of $2^{2}$.
Factor $63=3^{2}\times 7$. Rewrite the square root of the product $\sqrt{3^{2}\times 7}$ as the product of square roots $\sqrt{3^{2}}\sqrt{7}$. Take the square root of $3^{2}$.
