Question

Dada as seguintes raizes que se seguem: √32-2√2+√18

Answer 1

$\sqrt{32} -2 \sqrt{2} + \sqrt{18}$
$= \sqrt{2*4^{2} } -2 \sqrt{2} + \sqrt{2*3^{2} }$
$=4 \sqrt{2} -2 \sqrt{2} +3 \sqrt{2}$
$=(4-2+3) \sqrt{2}$
$=5 \sqrt{2}$