Question

Factorise 4x^2-9y^2

Answer 1

ans:4x²-9y² can be also written as (2x)²-(3y)²

now,as per identity a²-b²=(a+b)(a-b)

so,in case of our expression a=2x,b=3y

(2x²)-(3y)²=(2x+3y)(2x-3y)