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Which expression is not a polynomial in (x) though it looks algebraic?

Answer and explanation

Correct answer: \(x+\frac{2}{x}\)

In \(x+\frac{2}{x}\), \(\frac{2}{x}=2x^{-1}\). In a polynomial, every exponent of the variable must be a non-negative integer, but \(x\) has exponent \(-1\) here. Hence, option C is not a polynomial. In option D, \(x^0=1\), so the expression becomes \(7+4=11\), a constant polynomial. Exam tip: When a variable occurs in a denominator, rewrite it with a negative exponent to check whether it is a polynomial.

Related tags

Polynomial DefinitionNegative ExponentsAlgebraic ExpressionsClass 9 MathematicsConstant PolynomialDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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