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Which expression is not a polynomial because it contains (x^{-4})?

Answer and explanation

Correct answer: \(5x^{-4}+2x\)

\(5x^{-4}+2x\) is not a polynomial because the exponent of \(x\) is \(-4\). In a polynomial, exponents of variables must be zero or positive integers. Since \(x^0=1\), option C is a polynomial; a zero exponent is allowed, but a negative exponent is not. Exam tip: An expression with a negative, fractional, or irrational exponent of a variable is not a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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