x + 4
x2 + 8x + 15 = (x + 3) (x + 5).
x2 + 8x = x(x+8)
(x - 4)(x - 4)
16 + 6x - x2 = 16 + 8x - 2x - x2 = 8*(2 + x) - x*(2 + x) = (8 - x)*(2 + x)
x + 4
X2 + 8x + 16 = 10x +16x2 + 8x + 16=2x + 8x + 16=10x + 16
(x-4)(x-4)
x2 + 8x + 15 = (x + 3)(x + 5)
x2 + 8x + 15 = (x + 3) (x + 5).
That does not factor neatly.
x2 + 8x = x(x+8)
x2-8x+15 = (x-3)(x-5)
(x - 4)(x - 4)
16 + 6x - x2 = 16 + 8x - 2x - x2 = 8*(2 + x) - x*(2 + x) = (8 - x)*(2 + x)
x2 + 8x + 12 = (x + 6) (x + 2)
(x + 6)(x + 2)