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Which extra term is present in ( (m-n)^2 ) compared with (m^2+n^2)?

Answer and explanation

Correct answer: -2mn

Using the identity \((m-n)^2=m^2-2mn+n^2\), the extra term compared with \(m^2+n^2\) is \(-2mn\). The term \(2mn\) occurs in \((m+n)^2\), so it is a close but incorrect distractor. Exam tip: the middle term in a binomial square is always \(\pm2mn\); use the negative sign for subtraction.

Related tags

Algebraic IdentitiesBinomial SquareMinus SquareMiddle TermClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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