find the answer for this quadratic equation by using root formula X square + 8 x + 15 is equal to zero
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x^2+8x+15=0
x^2+5x+3x+15=0
x(x+5)+3(x+5)=0
(x+3)(x+5)=0
x=-3 or -5
x^2+5x+3x+15=0
x(x+5)+3(x+5)=0
(x+3)(x+5)=0
x=-3 or -5
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