# How do you simplify sqrt8 + sqrt18?

$\sqrt{8} = \sqrt{\left(2 \times 2\right) \times 2} = 2 \sqrt{2}$
$\sqrt{18} = \sqrt{\left(3 \times 3\right) \times 2} = 3 \sqrt{2}$
$\sqrt{8} + \sqrt{18} = 5 \sqrt{2}$