How do you factor $a²+4b-ab-4a$ ?

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Answer 1 · 2016-04-21T23:50:52

$=(a-4)(a-b)$

We'll solve this by factoring by grouping:
$a^2+4b-ab-4a=a^2-ab-4a+4b$
$=a(a-b)-4(a-b)$
$=(a-4)(a-b)$

How do you factor a²+4b-ab-4aa²+4b-ab-4a?