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Ancho = X + 4
Area = (X - 1)(X + 4) = X² + 4X - X - 4
X² + 3X - 4 = 204
X² + 3X - 4 - 204 = 0
X² + 3X - 208 = 0
Donde: a = 1; b = 3, c = -208
X1 = [- 3 + 29]/2 = 26/2 = 13
X2 = [-3 - 29]/2 = -32/2 = -16
Usamos X = 13
Entonces
Altura: X - 1 = 13 - 1 = 12 m
Ancho: X + 4 = 13 + 4 = 17 m
Area = 12 x 17 = 204 m²