Question

expand:(3x+4y)(3x-4y)​

Answer 1

$hello \: mate$

(3x+4y)(3x-4y)

We know that,

(a+b)(a-b)=a²-b²

So,

(3x+4y)(3x-4y)

=(3x)²-(4y)²

=9x²-16y²