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Which expression is not a polynomial because the variable is inside the denominator?

Answer and explanation

Correct answer: 5/(x + 2)

A polynomial is an expression made from constants and variables whose powers are non-negative whole numbers. The variable may be squared, cubed, or raised to another whole-number power, and irrational constants such as \(\sqrt{2}\) may be used as coefficients. However, a variable in the denominator is equivalent to a negative or non-polynomial power, so that expression does not meet the definition of a polynomial.

In option B, \(5/(x+2)\), the variable occurs in the denominator. Its value is not formed by a finite sum of terms with non-negative integer powers of \(x\), so it is not a polynomial. Option A has powers 2 and 1, option C has power 3, and option D uses \(\sqrt{2}\) only as a constant coefficient. Hence option B is correct.

Related tags

Polynomial DefinitionVariable In DenominatorRational ExpressionConstant CoefficientDefinition Of A PolynomialIntroduction To PolynomialsMathematicsClass 9 Mcq

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