Question

solve it correctly i don't want unnecessary solutions​

Answer 1

$( {5x + 3y)}^{2} \\ \\ = ( {5x)}^{2} + ( {3y)}^{2} + 2.5x.3y \\ \\ = 25 {x}^{2} + 9 {y}^{2} + 30xy$

Answer 2

Required answer is in the picture