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Largo = x + 2
Ancho = A
Area = x² - 4
Area = Largo por ancho
x² - 4 = (x + 2) * A
x² - 4 /(x + 2) = A Factorizas el numerador es una diferencia de
cuadrados aplicas a² - b² = (a + b)(a - b)
(x² - 2²)/(x + 2) = A
(x + 2)(x - 2)/(x + 2) = A Simplificas x + 2
x - 2 = A
Respuesta.
El ancho es igual a x - 2