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For every real value of \(a\), which of the following expressions will always be a quadratic polynomial in \(x\)?

Answer and explanation

Correct answer: \((a^2+1)x^2-5x+6\)

A quadratic polynomial must have a non-zero coefficient of \(x^2\). In option C, \(a^2+1>0\) for every real \(a\). In B, taking \(a=0\) removes the quadratic term. Exam tip: always check whether the leading coefficient can become zero.

Related tags

Quadratic ExpressionsQuadratic PolynomialLeading CoefficientAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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