Question

Square roots question??

Answer 1

Two things you need to know.
a square root that is squared becomes the number under the root  sign
the general formula is a^2 + 2ab + b^2
sqrt(5)^2 + 2*sqrt(5)*sqrt(3) + sqrt(3)^2
5 + 2sqrt(15) + 3 
8 + 2sqrt(15) <<<<=====
Stop! 
Don't go any further. That is your answer.

Answer 2

√5²+2*√5*√3+√3²

5+7.7+3

15.7