Quadratic formula to find complex roots (1 Viewer)

[henry08]

Use the quadratic formula to find all complex roots of the following polynomial:

z^2 + z + 1

How would I do this question?
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[shaon0]

Use the quadratic formula to find all complex roots of the following polynomial:

z^2 + z + 1

How would I do this question?
​

z=(-1+-sqrt(1^2-4))/2
=(-1+-isqrt(3))/2

 

[henry08]

Thanks

 

[henry08]

lol this from the algebra booklet?

just literally plug the coefficients into the quadratic formula (it just uses z instead of x)

when you get the negative in the square root, just make it positive and write i out the front of the square root sign.

Yes lol. Yeah, z is what was confusing me/