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Which of the following polynomials can be written as the product of two identical binomials?

Answer and explanation

Correct answer: x² + 8x + 16

The direct answer is A: x² + 8x + 16 = (x + 4)² = (x + 4)(x + 4). When two identical binomials are multiplied, the result has the form (x + a)² = x² + 2ax + a². The first term is x², the constant term must be a², and the middle coefficient must be 2a. In A, the constant 16 is 4² and 2 × 4 = 8, so every part matches. Option B has the required first two terms but 12 is not 4², so it cannot be a repeated binomial square. Option C is a difference of squares, (x − 4)(x + 4), whose factors are not identical. Option D has no middle term and is not a square of a binomial. A useful check is to expand the proposed repeated factor before accepting it.

Related tags

Perfect Square TrinomialFactorisationAlgebraic IdentitiesBinomial SquareExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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