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Riya says that \(x^2+10x+16\) can be written as \((x+5)^2\). Which is the correct form of \(x^2+10x+16\) to identify the error in Riya’s statement?

Answer and explanation

Correct answer: \((x+5)^2-9\)

\((x+5)^2=x^2+10x+25\). The given expression has constant term 16, so subtract 9 from 25: \(x^2+10x+16=(x+5)^2-9\). Exam tip: halve the coefficient of \(x\), then add and subtract its square.

Related tags

Quadratic ExpressionsCompleting The SquareAlgebraic IdentitiesClass 9 MathematicsError AnalysisExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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