x^2 + 40x - 624 =
(x-42) (x+12)
x^2 + 60x + 675 =
x^2 - 2x - 195 =
(x-15) (x+13)
(x+45)(x+15)
(x-15) (x+3)
(x+52) (x-12)
x^2 - 12x - 45 =
x^2 - 30x - 504 =
x^2 + 12x - 640 =
(x+32) (x-20