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Which expression is not a polynomial in (x) because (x) is hidden in the divisor?

Answer and explanation

Correct answer: \(\frac{2x^2+5}{x}\)

In option B, \(\frac{2x^2+5}{x}=2x+\frac{5}{x}=2x+5x^{-1}\). The exponent of \(x\) is \(-1\). In a polynomial, the exponent of a variable must be a non-negative integer, so this expression is not a polynomial. In contrast, option D has \(x^0=1\), giving \(4+7x\), which is a polynomial. Exam tip: When a variable occurs in the denominator, rewrite it with a negative exponent to test whether the expression is a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsVariable In DenominatorClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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