Question

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

3

4

5

6

Answer 1

4

Explanation:

Answer 2

4

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.