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y² + 15y + 56 = 0 Factorizas trinomio de la forma x² + bx + c
(y + 8)(y + 7) = 0 Tiene 2 soluciones reales
y + 8 = 0
y = - 8
o
y + 7 = 0
y = - 7
Solucion.
( - 8 , - 7)