factorise a^3-27b^3+2a^2b-6ab^2
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Step-by-step explanation:
a³-27b³+2a²b-6ab²
=(a-3b)[a²+a(3b)]+(3b)²+2ab(a-3b)
=(a-3b)(a²+3ab+ab²+2ab)
=(a-3b)(a²+3ab+ab²+2ab)
=(a-3b)(a²+5ab+9b²)
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