I am not sure what this type of equation is called, but anyway this is the formula

(3x+2y)^2 – (x-y)^2

4x + 6y

And the answer is =2x + y/2

So i know i have to factor out the numerator but for the life of me i cannot see how they come up with that answer, can anyone please explain how this works?

Much appreciated.

p.s what this type of equation called?