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What is the factorisation of (a² + 2ab + b²)?

Answer and explanation

Correct answer: (a + b)²

Answer: A, (a + b)². The identity for the square of a sum is (a + b)² = a² + 2ab + b². The given expression has the first square a², the last square b², and the middle term 2ab, exactly matching this identity. Therefore, a² + 2ab + b² = (a + b)². Option B would expand to a² - 2ab + b², so its middle sign is wrong. Option C is a difference of squares and expands to a² - b², so it has no 2ab term. Option D expands to a² + 2ab, leaving out b². To check the correct answer, multiply (a + b)(a + b): a² + ab + ab + b² = a² + 2ab + b². Memory cue: for a plus-square trinomial, the middle term is twice the product of the two square roots.

Related tags

Perfect Square TrinomialAlgebraic IdentitiesFactorisationBinomial SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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