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X + 5 = Largo
(X + 5)X = Area
X² + 5X = 644
X² + 5X - 644 = 0
Donde: a = 1; b = 5; c = -644
X1 = [-5 + 51]/2 = 46/2 = 23
X2 = [-5 - 51]/2 = -56/2 = -28
Uso X1 = 23
X = 23 cm
Ancho = 23 cm
Largo = 23 + 5 = 28 cm
Area = (23 cm)(28 cm) = 644 cm²