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[tex]25 a^{2} -(a+3) ^{2} [/tex]
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[tex]25 a^{2} -(a+3) ^{2} [/tex]
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25a² - (a + 3)² = (5a)² - (a + 3)² = (5a - a - 3)(5a + a + 3) = ( 4a - 3)(6a + 3) == 3(4a - 3)(2a + 1)