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Which expression is not a polynomial because the variable has exponent 1/3?

Answer and explanation

Correct answer: x^(1/3) + x^2

A polynomial in x may contain x^0, x, x², x³, and other fixed non-negative integer powers. Option B contains x^(1/3), whose exponent is one-third rather than an integer. This term represents the cube root of x, and a fractional power of the variable is not allowed in an ordinary polynomial in x. Thus option B is correct. Option A uses exponents 3, 1, and 0. Option C contains x⁰ = 1, so it simplifies to 3 + 4, a constant polynomial. Option D uses powers 5 and 0, since −2 is a constant term. All the exponents in A, C, and D satisfy the definition. The issue is the fractional exponent, not the fact that the expression includes a root-like operation.

Related tags

Definition-Of-PolynomialFractional-ExponentNon-PolynomialIntroduction To PolynomialsMathematicsClass 9 McqDefinition Of A Polynomial

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