Algebrahard · Past Paper
Factorize a^3 + b^3 + c^3 - 3abc.
A(a+b+c)(a^2+b^2+c^2-ab-bc-ca)
B(a+b+c)^3
C(a-b-c)(a^2+b^2+c^2)
D(a+b+c)(a^2+b^2+c^2+ab+bc+ca)
✓ Correct Answer: A — (a+b+c)(a^2+b^2+c^2-ab-bc-ca)
Standard cubic identity for three variables.
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