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Is \(6x^3+\frac{4}{x}\) a polynomial or not?

Answer and explanation

Correct answer: No, because \(\frac{4}{x}=4x^{-1}\) has a negative exponent of \(x\)

In a polynomial, the exponent of a variable must be a non-negative integer, such as \(0,1,2,\dots\). Here, \(\frac{4}{x}=4x^{-1}\), so the exponent of \(x\) is \(-1\). Therefore, \(6x^3+\frac{4}{x}\) is not a polynomial. Having two terms or real coefficients alone does not make an expression a polynomial. Exam tip: If a variable appears in the denominator, rewrite it with a negative exponent and check it.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsVariables In DenominatorClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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