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x^2+8x+15=0 Use any method

The answer is -3,-5 But i am having trouble getting that please show me steps thank you
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2 Answers

X^2 + 8X +15 =0
 
( X + a ) ( X +b ) =0
 
  a, b should be such that   a+b=8   ab = 15     and a = 5   b=3  is the answer.
x^2+8x+15=0
factor x^2+8x+15
5*3=15 and 5+3=8
(x+5)(x+3)=0
set each factor equal to 0
x+5=0
x=-5
x+3=0
x=-3