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Which expression is a polynomial in x?

Answer and explanation

Correct answer: 3x⁴ + x/5 − 6

The governing definition is that a polynomial in x is a finite sum of terms whose powers of x are non-negative integers; coefficients may be real numbers, including fractions. In option C, the powers are 4, 1 and 0, all of which satisfy the definition, and 1/5 is an allowed coefficient. Option A contains x⁻², option B contains the fractional power −1/2, and option D contains x³ᐟ² because √(x³) equals x³ᐟ² in the usual formal interpretation. Negative or fractional exponents disqualify those expressions from being polynomials. Therefore, option C is the unique correct answer.

Related tags

PolynomialsPolynomial DefinitionValid ExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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