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Is \(5x^2-\frac{2}{x}\) a polynomial or not?

Answer and explanation

Correct answer: No, because in \(\frac{2}{x}\), the variable is in the denominator

In a polynomial, the exponent of a variable must be 0 or a positive integer. Here, \(\frac{2}{x}=2x^{-1}\), so the exponent of \(x\) is \(-1\). Therefore, \(5x^2-\frac{2}{x}\) is not a polynomial. Although \(5x^2\) is a polynomial term, one negative exponent makes the complete expression non-polynomial. Exam tip: If a variable occurs in the denominator, rewrite it with a negative exponent and check it.

Related tags

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

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