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Which of the following is a quadratic expression in x?

Answer and explanation

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

In \(x^2-5x+6\), the highest power of \(x\) is 2, and it is a polynomial in \(x\); therefore, it is a quadratic expression. \(4x-9\) is linear, \(2x^3+x\) is cubic, and \(\frac{3}{x}+2\) is not a polynomial because \(x\) occurs in the denominator. Exam tip: a quadratic polynomial has highest exponent 2.

Related tags

Quadratic ExpressionsPolynomialsDegree Of PolynomialAlgebraic IdentitiesClass 9 MathematicsExploring Algebraic IdentitiesMathematicsClass 9 Mcq

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