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A student writes \((3x+2)^2\) as \(9x^2+4\). Which is the correct quadratic expression after correcting the error?

Answer and explanation

Correct answer: \(9x^2+12x+4\)

Using \((a+b)^2=a^2+2ab+b^2\), take \(a=3x\) and \(b=2\). The missing middle term is \(2\times3x\times2=12x\), so the expression is \(9x^2+12x+4\). Exam tip: always check the \(2ab\) term.

Related tags

Algebraic IdentitiesQuadratic ExpressionsBinomial SquareError AnalysisClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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