Answer:
Not a polynomial
Step-by-step explanation:
[tex]f(x)=5x^2-3x^4 +\frac{3}{4x}-7[/tex]
A polynomial function does not have x in the denominator
If there is any radical in f(x) , then it is not a polynomial
If there is any x in the denominator in f(x), then it is not a polynomial
In our given f(x), we have x in the denominator of third term
So the given f(x) is not a polynomial.