Factorise $2 x^{2} + 11 x - 21$

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Solution

$2 x^{2} + 11 x - 21 (Given) = 2 x^{2} + 14 x - 3 x - 21 = (x + 7) (2 x - 3) ∴ 2 x^{2} + 11 x - 21 = (x + 7) (2 x - 3)$

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