Factorise the following:
5p2 - 8pq - 10p + 16q
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= 5p2 - 10p - 8pq + 16q
= 5p(p - 2) - 8q(p - 2)
= (5p - 8q)(p - 2).
Hence, 5p2 - 8pq - 10p + 16q = (5p - 8q)(p - 2)
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