Homework Help: college algebra

Posted by lori on Monday, November 15, 2010 at 8:58pm.

What is the fundamental theorem of algebra of this polynomial in completed factored form? and how do I graph it?
f(x)=x^5-x^4+x^3-x^2+x-1

college algebra - Reiny, Monday, November 15, 2010 at 9:51pm
it says there should be 5 roots.
f(1) = 1-1+1-1+1-1 = 0
so (x-1) is a factor
by synthetic division I had
(x-1)(x^4 + x^2 + 1)

x^2 = (-1 ą √-3)/2 = (-1 ą i√3)/2

now take √ of that again.
So we get one real root of x=1 and 4 imaginary roots.

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