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Which of the following expressions is a perfect-square trinomial representing the square of a binomial?

Answer and explanation

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

\(a^2+2ab+b^2=(a+b)^2\), so it is a perfect-square trinomial. In option B, the middle term is not \(2ab\). Exam tip: take square roots of the first and last terms, then verify the middle term.

Related tags

Algebraic IdentitiesPerfect Square TrinomialBinomial SquareClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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