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Largo = x + 3
Ancho = x + 2
Area = 77
Formula.
Area del rectángulo = Largo por Ancho
77 = (x + 3)(x + 2)
77 = x² + 2x + 3x + 6
77 = x² + 5x + 6
0 = x² + 5x + 6 - 77
0 = x² + 5x - 71
x² + 5x - 71 = 0
Respuesta.
x² + 5x - 77 = 0