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Which of the following is the correct factorised form of a difference of two squares?

Answer and explanation

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

The difference-of-squares identity is \(a^2-b^2=(a+b)(a-b)\). On multiplying, the middle terms \(ab\) and \(-ab\) cancel. \((a-b)^2\) contains an extra \(-2ab\) term. Exam tip: check the signs before choosing an identity.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsPolynomial IdentitiesExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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