(x2 + 14x + 49) = (x + 7)2
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x2 - 14x + 49(x - 7) (x - 7)
(x - 3)(x - 11)
-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)
The roots are: x = -5 and x = -9
It is not possible to give a sensible answer to this question. The greatest common factor (GCF) refers to a factor that is COMMON to two or more numbers or expressions. You have only one expression in the question!