Question

I want answer for the first question

Answer 1

let a be 3x and b be 2y then it's (a+b)^2-(a-b)^2

=9x^2+4y^2+12xy-9x^2-4y^2+12xy

=24xy

Answer 2

(3x+2y)²+(3x-2y)²
(3x)²+(2y)²+2×3x×2y+(3x)²+(2y)²-2×3x×2y
9x²+4y²+12xy+9x²+4y²-12xy
18x²+8y² ans