Question

I have a question :]
X^4−4X^3+8X^2−16X+16
i know using some method i get
±1±2±4±8÷±1
I used X=-2 For synthetic division and got zero perfectly fine and got
1x3−2x2+4x−8vwhichgotme→x=±2iandx=2
but the X to the fourth should give me 4 roots right?

Answer 1

yes, let me check this ...

Answer 2

You have -2, 2, -2i and 2i. I believe you have all four.

Answer 3

HAHA!! you are right thanks again you know how when you use X=-2 you make it a 2 to use to divide out I just in my head think its a positive two :]

Answer 4

some days are longer than others :)