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Which of the following expressions is not a polynomial in x?

Answer and explanation

Correct answer: \(x^2+\frac{1}{x}+5\)

Option B contains \(\frac{1}{x}=x^{-1}\), so x has exponent \(-1\). In a polynomial in x, every exponent of x must be a non-negative integer. Options A, C, and D have only non-negative integer exponents, so they are polynomials. Exam tip: if a variable appears in the denominator or has a negative exponent, the expression is not a polynomial.

Related tags

PolynomialsPolynomial DefinitionNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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