Question

expand the following please​

Answer 1

$\huge\colorbox{red}{hope \: it \: helps \: you}$

Answer 2

Step-by-step explanation:

a) (3x-y)²

formula: (a-b)²=a²-2ab+b²

sol: (3x-y)²= (3x)²+2(3x)(-y)+(-y)²

= 9x² -6xy +y²

b) (x+y)²

formula: (a+b)²=a²+2ab+b²

Sol: (x+y)²=(x)²+2(x)(y) + (y)²

= x²+2xy+y²