Which of the following expressions are polynomials in one variable and which are not $?$ State reason for your answer. If the given expression is a polynomial, state whether it is a polynomial in one variable or not

$x^{2}+x-3+\frac{4}{x}$

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Given expression $x^{2}+x-3+\frac{4}{x}$ is not a polynomial because the index of $x$ in the fourth term $\frac{4}{x}$ is $-1$

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