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2a-3b
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6a
por que +3b suprime a -3b al ser su diferencia
Aplicando la propiedad distributiva de la multiplicación:
(4a + 3b)(2a - 3b) = (4a)(2a) - (4a)(3b) + (3b)(2a) - (3b)(3b)
(4a + 3b)(2a - 3b) = 8a² - 12ab + 6ab - 9b²