Factorise $4 x^{2} - 17 x - 21$

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Solution

$4 x^{2} - 17 x - 21 (Given) = 4 x^{2} - 21 x + 4 x - 21 = (4 x - 21) (x + 1) ∴ 4 x^{2} - 17 x - 21 = (4 x - 21) (x + 1)$

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