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

Answer and explanation

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

In a polynomial, the powers of the variable can only be non-negative integers such as 0, 1, 2, …. Here, \(\frac{1}{x}=x^{-1}\), so the exponent of x is −1. Therefore, option B is not a polynomial. In the other options, all powers of x are non-negative integers. Exam tip: if a variable appears in a denominator, rewrite it with a negative exponent to check whether it is a polynomial.

Related tags

PolynomialsDefinition Of PolynomialExponentsAlgebraic ExpressionsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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