-x2-14x-45 = -(x2+14x+45)
delta = 142-4*1*45=16
so x2+14x+45=(x-(-14+4)/2) (x-(-14-4)/2) = (x+5)(x+9)
so -x2-14x-45 = -(x+5)(x+9)
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(x2 + 14x + 49) = (x + 7)2
x2 - 14x + 49(x - 7) (x - 7)
x² + 8x + 15 = (x + 5)(x + 3)
The roots are: x = -5 and x = -9
(x - 3)(x - 11)