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x²₊8x₊15=0
Primero factorizamos
x²₊8x₊15
↓ ↓
x 3 ∴ 5x₊
x 5 3x
------
8x
Seria: (x₊3)(x₊5)=0
x₁: x₊3=0 x₂: x₊5=0
x=-3 x=-5
C.S(-3;-5)