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Which expression is the expansion of the perfect square of a binomial?

Answer and explanation

Correct answer: a² + 2ab + b²

Answer: A, a² + 2ab + b². The square of the binomial a + b is (a + b)² = a² + 2ab + b². Thus the expression has the required pattern: square of the first term, twice the product of the two terms, and square of the second term. Option B does not have the required middle term 2ab; its middle term is -ab. Option C has a negative final square, so it cannot be the expansion of (a + b)² or (a - b)². Option D is a difference of two squares and factors as (a - b)(a + b), but it is not a binomial square expansion. A useful verification is to multiply (a + b) by itself and combine the two ab terms. Memory cue: a binomial square has three terms and the middle term is ±2 times the product of the two terms.

Related tags

Perfect Square TrinomialBinomial SquareAlgebraic IdentitiesFactorisationExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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