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Which expression is a polynomial but not a quadratic polynomial?

Answer and explanation

Correct answer: \(4x^3+x-1\)

In \(4x^3+x-1\), the highest power of \(x\) is 3, so it is a cubic polynomial, not a quadratic polynomial. \(x^2+3x+2\) is the closest distractor, but its degree is 2, so it is quadratic. \(\sqrt{x}+1\) and \(\frac{1}{x}+2\) are not polynomials because the powers of \(x\) are \(\frac12\) and \(-1\), respectively. Exam tip: in a polynomial, variable exponents must be 0 or positive integers.

Related tags

PolynomialsDegree Of PolynomialQuadratic PolynomialCubic PolynomialAlgebraClass 9 MathematicsDegree Of A PolynomialIntroduction To Polynomials

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