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Which of the following expressions can be factorised as \((m-n)(m+n)\)?

Answer and explanation

Correct answer: \(m^2-n^2\)

The identity \((m-n)(m+n)=m^2-n^2\) represents a difference of squares, so A is correct. Options B and C are \((m+n)^2\) and \((m-n)^2\). Exam tip: look for a minus sign between two squares.

Related tags

Algebraic IdentitiesQuadratic ExpressionsDifference Of SquaresFactorisationClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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