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Which expression is not a polynomial in (x) because the variable has a negative power?

Answer and explanation

Correct answer: \(5x^{-3}+1\)

In \(5x^{-3}+1\), the exponent of \(x\) is \(-3\), which is negative. In a polynomial, the exponents of variables must be non-negative integers, so this expression is not a polynomial. \(7x^0-4x\) is a polynomial because \(x^0=1\). Exam tip: while identifying polynomials, check that no variable has a negative or fractional exponent, or appears in the denominator.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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