Factorise.
$9 x^{2} - 8 x - 1$

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Solution

$9 x^{2} - 8 x - 1$
$= 9 x^{2} - 9 x + x - 1$
$= 9 x (x - 1) - 1 (x - 1)$
$= (9 x - 1) (x - 1)$
Factos of $9 x^{2} - 6 x + 1 = (9 x - 1) (x - 1)$

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