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Riya says that \(7x^3-4x+1\) and \(x^{-2}+5\) are both polynomials because their coefficients are real. Which correction to Riya’s statement is correct?

Answer and explanation

Correct answer: Only \(7x^3-4x+1\) is a polynomial; \(x^{-2}+5\) has a negative exponent.

In a polynomial, every exponent of the variable must be a non-negative integer, that is, 0 or a positive integer. In \(7x^3-4x+1\), the exponents of \(x\) are 3, 1, and 0, so it is a polynomial. However, \(x^{-2}+5\) contains the exponent \(-2\), so it is not a polynomial. Having real coefficients alone is not sufficient. Exam tip: check all variable exponents before classifying an expression as a polynomial.

Related tags

Polynomial DefinitionNon-Negative ExponentsNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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