y = x2 + 8x + 15 = (x + 3)(x + 5).
When y = 0, one or other of the two factors must equal zero; that is, x = -3 or -5, when y = 0.
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x2 + 8x + 15 = (x + 3)(x + 5)
x² + 8x + 15 = (x + 5)(x + 3)
2x^2 + 8x + 3 = 0
x2 - 8x + 15 = 0 can be factored as (x - 3)(x - 5) = 0 : This holds true when one or both of the terms in brackets equals zero. When x - 3 = 0 then x = 3 When x - 5 = 0 then x = 5.
X2 + 8x + 16 = 10x +16x2 + 8x + 16=2x + 8x + 16=10x + 16