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Which expression is not a polynomial because the variable has power \(\frac{4}{5}\)?

Answer and explanation

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

The correct answer is \(x^{\frac{4}{5}}+2\) because the power of \(x\) is \(\frac{4}{5}\), a fractional exponent. In a polynomial, every exponent of the variable must be a non-negative integer such as \(0,1,2,\ldots\). The exponents in \(x^4+5\), \(5x^2+1\), and \(4x+5\) are 4, 2, and 1 respectively, so they are polynomials. Exam tip: To identify a polynomial, first check the exponents of its variables.

Related tags

PolynomialsFractional ExponentsNon-PolynomialAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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