Math, asked by tishamodi2112, 6 months ago

factorise trinomaial : a² ‐ 7ab ‐ 18b²

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Answered by reeboknike1

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Answered by studentof11th

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$a {}^{2} - 7ab - 18b {}^{2} \\ a {}^{2} - 9ab + 2ab - 18b {}^{2} \\ a(a - 9b) + 2b(a - 9b) \\ (a + 2b)(a - 9b)$

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