Question

Simplify the following expression :

iii) $(\sqrt{8}-\sqrt{2})(\sqrt{8}+\sqrt{2})$

Answer 1

Given : $(\sqrt{8}-\sqrt{2})(\sqrt{8}+\sqrt{2})$

Using identity, $(a-b)(a+b)=a^2-b^2$

$=(\sqrt{8}{)}^2-(\sqrt{2}{)}^2$

$=8-2$

$=6$