Question

V162+7V8-2V200-5V18 resolva

Answer 1

$\sqrt{162} +7 \sqrt{8} - 2 \sqrt{200} - 5 \sqrt{18}$
$= \sqrt{2*9^{2} } + 7 \sqrt{2*2^{2} } - 2 \sqrt{2*10^{2} } -5 \sqrt{2*3^{2} }$
$=9 \sqrt{2} +7*2 \sqrt{2}-2*10 \sqrt{2} -5*3 \sqrt{3}$
$=9 \sqrt{2} +14 \sqrt{2} -20 \sqrt{2} -15 \sqrt{2}$
$=(9+14-20-15) \sqrt{2}$
$=-12 \sqrt{2}$