(x + 2y)^2
(x - 4) (x + 4)
(x - 3) (x + 2)
3x (2x - 5)
(3x + 2y) (x + 3y)
6x^2 - 15x
x^2 - x - 6
3x^2 + 11xy + 6y^2
x^2 - 16
x^2 + 4xy + 4y^2
