2. Factorise the following polynomials:
i. 28(p - 4q)3 – 21a (p - 4q)
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28 ( p - 4q ) 3 - 21a ( p - 4q )
evaluate : 21 ( - a ( p - 4q ) - 12p )
expand : 84ap - 252p - 21ap
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