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Factorisation by Regrouping Terms

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Question

Find the factor of the polynomial given below.
$3 y^{2} - 2 y - 1$

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Solution

$3 y^{2} - 2 y - 1 = 3 y^{2} - 3 y + y - 1$
$= (3 y + 1) (y - 1)$

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