Question

(3x-y)(x+3y)+[3ysquare-3xsquare]​

Answer 1

$\huge \mathfrak \red{question}$

(3x-y)(x+3y)+(3y²-3x²)

$\huge \mathfrak \color{pink}{answer}$

Let's simplify step-by-step.

$\sf \red{(3x−y)(x+3y)+3y^2−3x^2}$

$\sf \color{green}{Distribute:}$

$\sf \red{=(3x)(x)+(3x)(3y)+(−y)} \\ \sf \red{(x)+(−y)(3y)+3y²+−3x²}$

=3x²+9xy+−xy+−3y²+3y²+−3x²

$\sf Combine \: Like \: Terms:$

=3x²+9xy+−xy+−3y²+3y²+−3x²

=(3x2+−3x²)+(9xy+−xy)+(−3y²+3y²)

$\sf \red{answer : 8xy}$