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Which of the following correctly represents the factorised form of
\(a^2-b^2\)

?

Answer and explanation

Correct answer: \((a-b)(a+b)\)

The difference-of-squares identity is \(a^2-b^2=(a-b)(a+b)\). On multiplying, the middle terms \(-ab\) and \(+ab\) cancel. In contrast, \((a-b)^2\) contains a \(-2ab\) term. Exam tip: for two squared terms with subtraction, look for the sum-and-difference factors.

Related tags

Algebraic IdentitiesDifference Of SquaresFactorisationClass 9 MathematicsPolynomialsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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