Factorise $9 x^{2} + 49 x + 20$

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Solution

$9 x^{2} + 49 x + 20 (Given)$
$= 9 x^{2} + 4 x + 45 x + 20$
$= (9 x + 4) (x + 5)$
$∴ 9 x^{2} + 49 x + 20 = (9 x + 4) (x + 5)$

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