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Which expression is a quadratic polynomial in (x)?

Answer and explanation

Correct answer: \(5x^2-4x+9\)

A quadratic polynomial has highest degree 2, and every exponent of the variable must be a non-negative integer. In \(5x^2-4x+9\), the highest power of \(x\) is 2, so it is quadratic. \(x^3+x+1\) is cubic, while \(x^{-2}+5\) is not a polynomial because it contains a negative exponent. Exam tip: identify the highest valid exponent of the variable to find the degree of a polynomial.

Related tags

PolynomialsQuadratic PolynomialDegree Of PolynomialNegative ExponentsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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