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Which expression is a polynomial in x and has highest power 5?

Answer and explanation

Correct answer: x⁵ − 2x² + 6

The governing concept is the definition and degree of a polynomial. A polynomial in x may contain only non-negative integer powers of x. In option A, the exponents are 5, 2, and 0. All are non-negative integers, and the greatest exponent is 5, so x⁵ − 2x² + 6 is a polynomial of degree 5. Option B has exponent 5/2, which is fractional and therefore invalid. Option C has the negative exponent −5. Option D can be rewritten as x⁻⁵ + 3, so it also contains a negative exponent. Those expressions are not polynomials in x. Hence option A is the only choice satisfying both requirements: being a polynomial and having highest power 5.

Related tags

Degree FivePolynomial DefinitionInteger ExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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