Question

factorise the following (x+y)²-(x-y)²​

Answer 1

Answer:

Step-by-step explanation:

(x+y)²-(x-y)²

(x+y)(x+y)-(x-y)(x-y)

x²+xy+xy+y²-(x²-xy-xy+y²)

x²+xy+xy+y²-x²-xy-xy+y²

x²+2xy+y²-x²-2xy+y²

x²-x²+2xy-2xy+y²+y²

=2y²