Homework Help: Pre-calculus

Posted by Lucy on Monday, October 13, 2008 at 11:46am.

Which of the following is NOT a root of z^2 = 1-sqrt3i to the nearest hundreth.

a) -0.22+1.24i
b) -0.97-0.81i
c) 1.02-0.65i
d) 1.18-0.43i

Thanks for any help you can give me.

Pre-calculus - drwls, Monday, October 13, 2008 at 12:12pm
I don't get it. NONE of those numbers, when squared, give you anything close to 1 - i sqrt3. In polar form r(e^i theta), the magnitude r of a valid answer would have to be 2. None of the four choices comes close.
Pre-calculus - Reiny, Monday, October 13, 2008 at 12:26pm
I agree with drwls.

I simply squared some of your answers and should have gotten 1-√3i

none worked, so none are roots.

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