Question

Escreva as multiplicações na forma mais simples a) $\sqrt{6} * \sqrt{3}$

b)$\sqrt{28} * \sqrt{21}$

c)$\sqrt{10} * \sqrt{20}$

Answer 1

$\sqrt{6}\cdot\sqrt{3}=\sqrt{2}\cdot \sqrt{3}\cdot \sqrt{3}=3\sqrt{2}\\\\ \sqrt{28}\cdot\sqrt{21}=\sqrt{4}\cdot\sqrt{7}\cdot\sqrt{7}\cdot\sqrt{3}=\\ =2\cdot7\cdot\sqrt{3}=14\sqrt{3}\\\\ \sqrt{10}\cdot\sqrt{20}=\sqrt{10}\cdot\sqrt{10}\cdot\sqrt{2}=10\sqrt{2}$