Is the following expression a polynomial? Justify your answer:
$\sqrt{3} x^{2}-2 x$

(A) The expression is $\sqrt{3} x^{2}-2 x$.
In this expression,the variable is $x$.
The exponents of the variable $x$ in the terms $\sqrt{3} x^{2}$ and $-2 x$ are $2$ and $1$,respectively.
Since both $2$ and $1$ are whole numbers,the expression satisfies the condition for being a polynomial.
Therefore,$\sqrt{3} x^{2}-2 x$ is a polynomial.