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If \((a+b)^2=a^2+10ab+b^2\), what is the error in the middle term compared to the standard identity \((a+b)^2=a^2+2ab+b^2\)?

Answer and explanation

Correct answer: The middle term should be \(2ab\), so the error is \(10ab-2ab=8ab\).

The standard identity gives the middle term as \(2ab\). The given expression has middle term \(10ab\). So the difference (error) is \(10ab-2ab=8ab\).

Related tags

Algebraic IdentitiesBinomial SquareErrors In ExpressionsGrade 9

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