Which of the following expressions are polynomials? Check all that apply.


Check all that apply.

A. x^3+ 2x^2
B. 2x^-3 - 5x^-1 + 3
C. 1/4 x^5 + 1/3 x^4 -1/2 x^3
D. -9x
E. 5/x -1