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In which option is the expression not a polynomial although all its coefficients are real?

Answer and explanation

Correct answer: 6x^(-2) + 8

A polynomial can have any real coefficients, including irrational real numbers such as √3 and √5. However, every exponent of the variable must be a fixed non-negative integer. Option A has x-powers 3, 1, and 0, so it is a polynomial despite the coefficient √3. Option B has powers 2, 1, and 0 and is also a polynomial. Option C has powers 4 and 0; √5 is merely a real coefficient, so it remains a polynomial. In option D, x has exponent -2, and 6x^(-2) means 6/x^2. A negative exponent or a variable in the denominator violates the polynomial definition. Therefore, option D is correct.

Related tags

Definition-Of-PolynomialReal-CoefficientsNegative-ExponentsDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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