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.

## Answer this Question

## Related Questions

- precalculus with applications - Which of the following is not a root of z^2= 1-...
- Pre-Algebra - Also need help with this one- Approximate the square root to the ...
- Pre-Algebra - How can I solve this problem, I'm stuck on it: Approximate to the ...
- Pre-Calculus - Solve for 0¡Üx<2¦Ð. Round to nearest hundreth of a radian. ...
- calculus - find a square root of -7-24i
- Algebra check? - Sorry the first post formatted weirdly. 1. 3i - 10 --------- 8i...
- Algebra - Can you tell me if my answers are correct for these problems? 1. 3i - ...
- Pre-Calculus - Solve. Express your answer as exact roots. (s+6)^2 = 3/4 Sq root...
- Please Help Me With My Math Homework - I wrote my math homework questions. It's ...
- Pre-Calculus - Solve 0 = 3x^2 + 5x -1 by completing the square. Express your ...

More Related Questions