Question

raiz quadrada de 2 vezes raiz quadrada de 8

Answer 1

$\sqrt2\times\sqrt8=\sqrt{2\times8}=\sqrt{16}=4$

Answer 2

√2 * √8 = √2 * √(4 * 2) = √2 * √(2² * 2) = √2 * 2√2 = 2 * 2 = 4
Ou...
√2 * √8 = √(2 * 8) = √16 = 4