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Which of the following expressions is not generally a perfect square of a binomial?

Answer and explanation

Correct answer: \(a^2-b^2\)

\(a^2-b^2=(a+b)(a-b)\) is a difference of squares, so it is not generally the square of a binomial. In contrast, A, B and D are \((a+b)^2\), \((a-b)^2\) and \((2a+b)^2\). Exam tip: use the middle term to identify the binomial signs.

Related tags

Algebraic IdentitiesPerfect SquareDifference Of SquaresBinomial SquareClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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