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x² + 4xy + 4y² - 16z² Descomponiendo 4xy = 2(x)(2y) , 4y = (2y)² y 16z² = (4y)²
x² + 2(x)(2y) + (2y)² - (4z)² Tenemos el binomio(x + 2y)² =x² + 2(x)(2y) + (2y)²
(x + 2y)² - (4z)² Aplicamos diferencia de Cuadrados:
(x + 2y - 4z)(x + 2y + 4z)
Respuesta:
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Los factores son (x + 2y - 4z)(x + 2y + 4z)