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Which of the following is not a polynomial in (x)?

Answer and explanation

Correct answer: (\frac{5}{x}+1)

The direct answer is option C: \(\frac{5}{x}+1\) is not a polynomial in \(x\). A polynomial is made from constants and non-negative integral powers of the variable, such as \(x^0,x^1,x^2\), combined by addition, subtraction, and multiplication. In \(5/x\), the variable is in the denominator, so \(5/x=5x^{-1}\); the exponent is negative, which is not allowed in a polynomial. Option A, \(x^2+3x\), is a polynomial because its powers are 2 and 1. Option B, \(7x-4\), is a polynomial because it has powers 1 and 0. Option C fails because of the negative power. Option D, 9, is a constant polynomial; it can be viewed as \(9x^0\). Do not be confused by the way the options are printed: the mathematical expressions being tested are the displayed expressions themselves. Memory cue: variable in a denominator usually means “not a polynomial.”

Related tags

PolynomialNon PolynomialDenominator

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