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Caso.
Diferencia de cuadrados.
Aplicas.
a² - b² = (a + b)(a - b)
4x²/25 - 9/49 =
2²x²/5² - 3²/7² =
(2x/5 + 3/7)(2x/5 - 3/7)
Respuesta.
(2x/5 + 3/7)(2x/5 - 3/7)