Question

Multiply and simplify xFormula1" title="( \sqrt{13}+3) ( \sqrt{13}-3 )" alt="( \sqrt{13}+3) ( \sqrt{13}-3 )" align="absmiddle" class="latex-formula">
Show steps please

Answer 1

$(a+b)(a-b)= a^{2} - b^{2} \\ ( \sqrt{13}+3 )( \sqrt{13}-3 )= (\sqrt{13})^{2} - (3)^{2} =13-9=4$

Answer 2

$\sqrt{13}. \sqrt{13}+3. \sqrt{13}-3. \sqrt{13}-3.3=13-9=4$