Question

root 13 minus root 7 the whole square

Answer 1

$(\sqrt{13} - \sqrt{7} ) ^{2} \\ using \: identity => (a - b) ^{2} = {a}^{2}+{b}^{2} - 2ab \\ => ( \sqrt{13} ) ^{2} + ( \sqrt{7} )^{2} - 2( \sqrt{13})( \sqrt{7} ) \\ => 13 + 7 - 2 \sqrt{91} \\ => 20 - 2 \sqrt{91}$