Question

Qual o valor da expressão

3v2 - 2 v18 + 3 v72

Answer 1

$3\sqrt{2}=3\sqrt{2}\\ 2\sqrt{18}=2*(3\sqrt{2})=6\sqrt{2}\\ 3\sqrt{72}=3*(2*3*\sqrt{2})=18\sqrt{2}\\\\ 3\sqrt{2}-2\sqrt{18}+3\sqrt{72}=\\\\ 3\sqrt{2}-6\sqrt{2}+18\sqrt{2}=\\\\ 15\sqrt{2}$