Factorise the following:
p2 - (a + 2b)p + 2ab
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p2 - (a + 2b)p + 2ab = p2 - ap - 2bp + 2ab
= p2 - 2bp - ap + 2ab
= p(p - 2b) - a(p - 2b)
= (p - 2b)(p - a).
Hence, p2 - (a + 2b)p + 2ab = (p - 2b)(p - a).
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