How many complex roots does the equation 0=4x4-x3-5x+3 have?

3

4

5

6

4

Step-by-step explanation:

Descarte's rule of signs tells you that there will be 0 or 2 positive real roots and 0 negative real roots. A graph shows there are no positive x-intercepts, so 0 real roots.

All four roots are complex.