x^2-x-42
x^2-17x+72
x^2+13x-30
x^2+8x+15
x^2+13x+30
x^2+x-20
(x+15)(x-2)
(x+6)(x-7)
(x-9)(x-8)
(x+5)(x+3)
(x-4)(x+5)
(x+3)(x+10)
