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Why is x^2 + cube root of x not a polynomial?

Answer and explanation

Correct answer: Because ∛x = x^(1/3)

The governing concept is the definition of a polynomial in one variable. In a polynomial, the exponent of the variable in every term must be a non-negative integer such as 0, 1, 2, or 3. The cube root of x can be rewritten as x^(1/3), so the expression becomes x^2 + x^(1/3). Although x^2 is an acceptable polynomial term, the exponent 1/3 is fractional and therefore violates the polynomial definition. Thus option A states the correct reason. Having two terms is allowed, and addition is also allowed in a polynomial. The presence of x^2 is not a problem either. The issue is specifically the fractional exponent on the variable, not the number of terms or the operation joining them.

Related tags

Polynomial DefinitionFractional ExponentCube RootDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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