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Riya claims that \(5x^{-1}+2\) is a polynomial because it contains only \(x\) and numbers. What is the main error in her claim?

Answer and explanation

Correct answer: The exponent of the variable must be a non-negative integer; an exponent of \(-1\) is not allowed.

In a polynomial, variable exponents are \(0,1,2,\ldots\). Here, \(x^{-1}=1/x\), so the variable occurs in the denominator and the expression is not a polynomial. Exam tip: check negative exponents first.

Related tags

PolynomialsDefinition Of PolynomialExponentsNegative ExponentsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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