factorise this question
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a³ - 27b³ -7a²b -21ab²
= [a³ - (3b)³] -7ab(a-3b)
= (a-3b)[a²+a(3b)+(3b)²]-7ab(a-3b)
=(a-3b)[a²+3ab+9b²-7ab]
=(a-3b)(a²-4ab+9b²)
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