Question

please help i have to use Descartes' Rule of Signs to analyze the zeros of the following and list all possibilities.

Answer 1

P(x) = x^5 - 4x^4 + 3x^3 + 2x - 6

Answer 2

to get the numbers of positive roots, substitute the vale of x by (1)

and to get the number of negative roots, substitute x by (-1)

and count all the terms that has + and - signs.

for example:

f(x)=2x-3
f(1)=+2(1) -3 __ this is count as one

Answer 3

ok

Answer 4

for all roots you can use Ruth Herwits method it works for complex roots.
if you would I can explain.?

Answer 5

please explain