Question

certo ou errado? a) V9-V4 b)V36+V64=V100 c) V21+V21=V42 d) V10+V10=2V10​

Answer 1

Resposta:

$a)~~\sqrt{9} -\sqrt{4} =1\\ 3-2=1\\ 1=1~~Certo\\ \\ b)~~\sqrt{36} +\sqrt{64} =\sqrt{100} \\ 6+8=10\\ 14\neq 10~~Errado\\ \\ c)~~\sqrt{21} +\sqrt{21} =\sqrt{42} \\ 2\sqrt{21} \neq \sqrt{42} ~~Errado\\ \\ d)~~\sqrt{10} +\sqrt{10} =2\sqrt{10} \\ 2\sqrt{10} =2\sqrt{10} ~~Certo$