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Q. Factorise
7. $3 a^{5} - 108 a^{3}$

Hi, Assuming question as 3 a^{5} - 108 a^{3} = 3 a^{3} [a^{2} - 36] = 3 a^{3} [a^{2} - 6^{2}] We know that x^{2} - y^{2} = (x - y) (x + y) = 3 a^{3} (a - 6) (a + 6)

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Q. Factorise 7. 3 a 5 - 108 a 3