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Caso.
Diferencia de cuadrados.
Aplicas.
a² - b² = (a + b)(a - b)
81x² - 36y² =
9²x² - 6²y² =
(9x + 6y)(9x - 6y)
Respuesta.
(9x + 6y)(9x - 6y)
81X²-36Y² = (9X)²-(6Y)² = (9X+6Y)×(9X-6Y)
rpta= (9X+6Y)×(9X-6Y)