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x^2 + 4x +3 = 35⇒ x^2 + 4x - 35 = 0 Ecuación de segundo grado se iguala a cero
x^2 + 4x - 32 = 0 Factorización
(x + 8 ) ( x - 4)
x = - 8
x = 4
Remplazando
(4+1) ( 4+3 )
5 * 7 = 35
-8 + 1 = -7 -8+3 = -5 = 35