Factorise: (a^2-a ) (4 a^2-4 a-5 )-6 - Vidyadip

Question

Factorise:
$\left(a^2-a\right)\left(4 a^2-4 a-5\right)-6$

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Answer

$(a-2)(a+1)\left(4 a^2-4 a+3\right)$

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