Factorise the polynomial: $m^{2} - m n + 4 m - 4 n$

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Solution

$m^{2} - m n + 4 m - 4 n$
$= m (m - n) + 4 (m - n)$
$= (m + 4) (m - n)$
The factors are $(m + 4), (m - n)$

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