x2+7x+6
(x+1)(x+4)
(x2- 4)
x2+4x+4
(x+3)(x-4)
(2x+1)(2x-1)
x2-25
x2+2x+1
x2+3x+2
(x+6)(x-6)
x2-36
x2-x-12
(x-2)(x+2)
(x+1)(x+1)
(x+1)(x+2)
(x+2)2
(x+1)(x+6)
(x+5)(x-5)
4x2-1
x2+5x+4
