Question

I don't exactly understand Descartes' rule of signs so if someone could please help me on the equation attached?

Answer 1

read it. http://www.purplemath.com/modules/drofsign.htm

Answer 2

Yeah use loser66's link its really long to explain without examples

Answer 3

So I solve for f(-x) to get 3x^4+5x^3+5x^2-5x+2, ending up with possibly 2 negative roots?

Answer 4

i couldn't tell you you didn't show the original equation

Answer 5

if you changed the signs on your odd exponents then yes

Answer 6

I attached a file with the original equation

Answer 7

there is a very good video explanation of this method here: http://www.youtube.com/watch?v=1utFwnmBOyU