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Which expression is a polynomial in x because all powers of the variable are positive integers or zero?

Answer and explanation

Correct answer: 2x⁶ − 4x² + 9

The defining condition for a polynomial in x is that every exponent of x must be a non-negative integer. In option A, the terms are 2x⁶, −4x², and 9, with exponents 6, 2, and 0 respectively. All three exponents satisfy the condition, so option A is a polynomial. The absence of x⁵, x⁴, x³, or x terms does not matter; a polynomial may have missing powers. Option B contains the negative exponent −4. Option C includes 7/x = 7x⁻¹, another negative power. Option D has the fractional exponent 2/3. Therefore only option A meets the stated definition, regardless of whether every intermediate power appears.

Related tags

PolynomialNon-Negative Integer PowersPolynomial DefinitionDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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