1.

Which of the following expressions is a polynomial?

A.  \[3{{x}^{\frac{1}{2}}}-4x+3\]        
B.  \[4{{x}^{2}}-3\sqrt{x}+5\]
C.  \[3{{x}^{2}}y-2xy+5{{x}^{4}}\]  
D.  \[2{{x}^{4}}+\frac{3}{{{x}^{2}}}-1\]
Answer» D.  \[2{{x}^{4}}+\frac{3}{{{x}^{2}}}-1\]


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