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Which expression is not a polynomial because it contains (\log x)?

Answer and explanation

Correct answer: (x^2+\log x)

The definition of a polynomial in x permits constants and terms involving x raised only to non-negative integer powers. The expression log x is a logarithmic function, not a permitted power term such as x^0, x, or x^2. Therefore x^2 + log x is not a polynomial in x. This conclusion does not depend on the fact that the expression has two terms; two-term polynomials are possible.

Option A is correct because it contains log x. The other choices satisfy the polynomial rules: x^2 + 5x + 1 has integer powers, 7x^3 - √2 includes √2 only as a constant, and x^0 + 4x simplifies to 1 + 4x. Hence the logarithmic term, rather than addition or the number of terms, is the decisive reason.

Related tags

Definition-PolynomialLogarithmic-TermNot-Polynomial

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