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Which of the following expressions is a factor of the sum of two cubes?

Answer and explanation

Correct answer: \(a+b\)

The identity for a sum of cubes is \(a^3+b^3=(a+b)(a^2-ab+b^2)\), so \(a+b\) is a factor. The factor \(a-b\) belongs to the difference-of-cubes identity. Exam tip: check the sign between the cubes first.

Related tags

Algebraic IdentitiesSum Of CubesFactorisationPolynomialsClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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