$$( \sqrt { 13 } - \sqrt { 6 } ) ( \sqrt { 13 } + \sqrt { 6 } )$$
$7$
$$\left(\sqrt{13}\right)^{2}-\left(\sqrt{6}\right)^{2}$$
$$13-\left(\sqrt{6}\right)^{2}$$
$$13-6$$
$$7$$
Show Solution
Hide Solution
