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Aplicas productos notables.
La suma por la diferencia de doss cantidades.
(a + b)(a - b) = a² - b²
(4a - 5)(4a + 5) =
(4a)² - 5² =
4²a² - 25 =
16a² - 25
Respuesta.
16a² - 25
16a^2 - 25