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Factorizas.
Aplicas.
Productos notables.
(a + b)(a - b) = a² - b²
(1 + x)(x- 1) - (4 + x)(x - 4)
(x + 1)(x - 1) - (x + 4)(x - 4) =
x² - 1² - (x² - 4²) =
x² + 1 - (x² - 16) = Para quitar parentesis aplicas ley de signos
- por + = - y - por - = +
x² + 1 - x² + 16 = Simplificas terminos semejantes
17
Respuesta.
17