x^2 + 10x + 15 = 0 pa factor
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use completing the square:
x^2 + 10x = -15
x^2 + 10x + __ = -15 + __
u need to use : (b/2)^2, for the constant to make a perfect square trinomal
(10/2)^2
5^2
25
x^2 + 10x + 25 = -15 + 25
(x + 5)(x + 5) = 10
(x + 5)^2 = 10
(x + 5)(x + 5) - 10 = 0, or;
(x + 5)^2 - 10 = 0