Find the number of complex roots for each equation:
2x^4+x^3-3x^2+4x-2

Question

Find the number of complex roots for each equation:
2x^4+x^3-3x^2+4x-2

freckles · Answer

let's try to plug in some possible rational zeros...
when you plug in x=1 do we get 0?
well 
2(1)^4+(1)^3-3(1)^2+4(1)-2
2        +1      -3         +4   -2
      2+1-3+4-2
          3-3+4-2
                  4-2=2 which is not 0
you can try the other possible rational zeros...

But before we move on did you post the right expression?

cold3693 · Answer

It all equals 0 that, otherwise it's right.

freckles · Answer

$$2x^4+x^3-3x^2+4x-2=0 \text{ \right ?}$$

cold3693 · Answer

Yes

freckles · Answer

oh find the number of

freckles · Answer

not find the solutions

freckles · Answer

do you know descartes rule of signs

cold3693 · Answer

No, it wasn't in our curricular so it was never taught.

freckles · Answer

ok well if you consider a real number also a complex number which it is 
then at max there should be 4 since the degree of the polynomial is 4

freckles · Answer

That is all I can see to do since you don't know Descartes's rule of signs

cold3693 · Answer

Alright thanks.