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Which expression is not a polynomial in (y)?

Answer and explanation

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

In \(\frac{5}{y}+2\), we have \(\frac{5}{y}=5y^{-1}\). The exponent of \(y\) is \(-1\), whereas every variable exponent in a polynomial must be a non-negative integer. Hence, option A is not a polynomial. Options B and C have valid non-negative integral exponents, and 7 is a constant polynomial. Exam tip: If a variable appears in the denominator, rewrite it using a negative exponent to check whether the expression is a polynomial.

Related tags

PolynomialsDefinition Of PolynomialNegative ExponentsAlgebraClass 9 MathematicsDefinition Of A PolynomialIntroduction To PolynomialsMathematics

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