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Which expression is not a polynomial in x although it has only two terms?

Answer and explanation

Correct answer: x^(-1) + 8

Having two terms means an expression may be a binomial, but it does not automatically make the expression a polynomial. The polynomial condition must also be checked: every exponent of x must be a non-negative integer. Option C contains x⁻¹, which is equal to 1/x. Thus x has a negative exponent and occurs in a denominator, so the expression is not a polynomial even though it has two terms. Option A has valid exponents 5 and 0, option B has exponents 2 and 0, and option D has exponents 1 and 0. These are all binomial polynomials. Therefore option C is correct. This demonstrates that the number of terms and the validity of the exponents are separate classification tests.

Related tags

Definition-Of-PolynomialBinomialNegative-ExponentIntroduction To PolynomialsMathematicsClass 9 McqDefinition Of A Polynomial

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