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Which is the correct algebraic identity for factorising the sum of two cubes?

Answer and explanation

Correct answer: \(a^3+b^3=(a+b)(a^2-ab+b^2)\)

The sum of two cubes factorises as \((a+b)(a^2-ab+b^2)\). On multiplying, the middle \(ab\) terms cancel, leaving \(a^3+b^3\). Exam tip: for a sum, use \(a+b\) first and a negative middle term in the quadratic factor.

Related tags

Algebraic IdentitiesSum Of CubesFactorisationPolynomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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