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X = Ancho
X + 2 = Largo
Area = X(X + 2) = X² + 2X
X² + 2X = 48
X² + 2X - 48 = 0
Donde: a = 1; b = 2; c = -48
X1 = [-2 + 14]/2 = 12/2 = 6
X2 = [-2 - 14]/2 = -16/2 = -8
Uso X1
X = 6 cm
Entonces la expresion seria
B) X² + 2X = 48