(a + b + c)(a²+ b² + c² – bc – ca – ab)
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Step-by-step explanation:
(a + b + c)(a²+ b² + c² – bc – ca – ab)
= a3+ab2+ac2 -abc- a2c -a2b+ a2b +b3+ bc2 -b2c -abc -ab2 +a2c + b2c + c3 - bc2 - ac2 - abc
= a3 + b3 + c3 -3abc
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