Which of the following expressions is a polynomial? State the reason. If an expression is a polynomial,state whether it is a polynomial in one variable or not.
$5x^2 + 11x - 2\sqrt{x}$
$5x^2 + 11x - 2\sqrt{x}$
(N/A) The given expression is $5x^2 + 11x - 2\sqrt{x}$.
In the term $-2\sqrt{x}$,the exponent of $x$ is $1/2$,which is not a non-negative integer.
Since a polynomial must have only non-negative integer exponents for its variables,this expression is not a polynomial.
In the term $-2\sqrt{x}$,the exponent of $x$ is $1/2$,which is not a non-negative integer.
Since a polynomial must have only non-negative integer exponents for its variables,this expression is not a polynomial.
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