Question

A²-2B² para A=√2 + √8 e B= √6

Answer 1

$\sqrt{2 {}^{2} } + \sqrt{8 {}^{2} } - 2 \sqrt{6 {}^{2} }$

$\sqrt{4 } + \sqrt{64 } - 2 \sqrt{36}$

2 + 8 - 12

2 - 4

-2