Factorise: a³ - b³

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• A (a+b)(a-b+b²)
• B (a+b)(a²+ab-b²)
• C (a-b)(a²+ab+b²)
• D (a-b²)(a²-ab-b²)

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Answer: C. (a-b)(a²+ab+b²)

a³ - b³ = (a - b)(a² + ab + b²). Multiplying out the brackets gives back a³ - b³.

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