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Which expression is a polynomial with only even powers?

Answer and explanation

Correct answer: \(x^6-4x^2+9\)

In \(x^6-4x^2+9\), the powers of \(x\) are 6, 2, and 0; the constant term 9 has power 0. All are even, non-negative integers, so it is a polynomial with only even powers. In option B, \(x^5\) has an odd power. Option C has a negative exponent, and in option D, \(\sqrt{x}=x^{1/2}\) has a fractional exponent, so neither is a polynomial. Exam tip: every exponent of a variable in a polynomial must be a non-negative integer.

Related tags

Polynomial DefinitionEven PowersExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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