Factorize: $a (a - 4) - a + 4$

(a - 4) (a - 1)

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(3 a - 4) (a - 1)

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(9 a - 4) (2 a - 1)

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(7 a - 4) (a - 1)

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Solution

The correct option is D $(a - 4) (a - 1)$
$a (a - 4) - a + 4$
$= a (a - 4) - (a - 4)$
$= (a - 4) (a - 1)$

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