Posted by Lucy on Monday, October 13, 2008 at 11:46am.
Which of the following is NOT a root of z^2 = 1sqrt3i to the nearest hundreth.
a) 0.22+1.24i
b) 0.970.81i
c) 1.020.65i
d) 1.180.43i
Thanks for any help you can give me.

Precalculus  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.

Precalculus  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...
 PreAlgebra  Also need help with this one Approximate the square root to the ...
 PreAlgebra  How can I solve this problem, I'm stuck on it: Approximate to the ...
 PreCalculus  Solve for 0¡Üx<2¦Ð. Round to nearest hundreth of a radian. ...
 calculus  find a square root of 724i
 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  ...
 PreCalculus  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 ...
 PreCalculus  Solve 0 = 3x^2 + 5x 1 by completing the square. Express your ...
More Related Questions