Question

efetue as multiplicaçoes
a) √5.√7
b) 5√2a.5√7a
c) 3.√2.9√3
d) 3√xy.3√xy
preciso das contas

Answer 1

$a) \sqrt{5}* \sqrt{7}= \sqrt{5*7} = \sqrt{35} \\\\ b)5* \sqrt{2}*a*5 \sqrt{7}*a=5^2*a^2* \sqrt{2*7} =25*a^2* \sqrt{14} \\\\ c)3* \sqrt{2} *9 \sqrt{3}=3*9* \sqrt{2*3} =27 \sqrt{6}\\\\ d)3* \sqrt{x*y}*3 \sqrt{x*y}=(3\sqrt{x*y})^2=9*x*y$

Answer 2

Vlw me ajudou muito !