x2 - 6x - 7
X2 + 7X + 12
X2 - 16X + 15
(X + 7)(X + 5)
X2 + 8X + 35
(X - 15)(X - 1)
(x - 5)(x - 3)
(x - 7)(x + 1)
x2 - 8x + 15
(x + 4)(x + 3)
X3 + 4X2 - 5X
X(X + 5)(X - 1)
