It can't be factored because the discriminant is less than zero.
x2 + 6x + 8 = (x + 4)(x + 2)
4(x2 - 6x + 13)
Not factorable
x2 + 6x + 5 can be factored into (x+1) (x+5)
x2-6x+9 = (x-3)(x-3) when factorised.
x2 + 6x - 2 = 0 x2 + 6x + 9 = 13 (x + 3)2 = 13 x + 3 = ± √13 x = -3 ± √13
(x + 3)(x + 3)
x2 + 6x + 8 =(x + 2)(x +4)
3(x2 - 2x + 3)
(x - 3)(x - 3)
X - 4
(x+3)(x+3)