Question

According to Descartes's rule of sign, how many possible positive and negative roots are there for the equation 0=4x7−2x4+2x3−4x−9 ?

Number of positive roots:
Number of negative roots:
0, 1 only, 2, only, 0 or 2. 3 only. 1 or 3

Answer 1

Number of possible positive roots: 1 or 3

Number of possible negative roots: 0 or 2

Explanation:

I don't have one but I got it wrong on the quiz and it's telling me the answers so I thought I'd give it to you all :)