Factorise $21 x^{2} - 31 x + 8$

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Solution

$21 x^{2} - 31 x + 8 (Given) = 21 x^{2} - 24 x - 7 x + 8 = (7 x - 8) (3 x - 1) ∴ 21 x^{2} - 31 x + 8 = (7 x - 8) (3 x - 1)$

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