Question

Express the following as a mixed surd in its simplest form.
$\sqrt{80}$.

Answer 1

$=\sqrt{80}$

$=\sqrt{20\times 4}$

$=\sqrt{4\times 4\times 5}$

$\sqrt{4^2\times 5}$

$4\times \sqrt{5}=4\sqrt{5}$