Question

write down the squares from the following expression
3х + 5у​

Answer 1

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: (3x + 5y) {}^{2}$

$using \: (x + y) {}^{2} = {x}^{2} + {y}^{2} + 2xy$

$= > (3x) {}^{2} + (5y) {}^{2} + 2(3x)(5y)$

$\: \: = > \: \: \: \: 9 {x}^{2} + 25 {y}^{2} + 30xy$