factorise $a (a - 4) - a + 4$

(a - 1) (a - 1)

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(a - 4) (a - 1)

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(a - 1) (a + 1)

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(a - 4) (a + 1)

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Solution

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

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