Which of the following is NOT a polynomial?

Which of the following is NOT a polynomial?
  1. $x^{2} + \dfrac{1}{x} + 3$
  2. $3x^{2} + 5$
  3. $x - 1$
  4. $5$

Solution

$\dfrac{1}{x} = x^{-1}$ has a negative exponent; not a polynomial.

Asked in: MH-SSC-9

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