complex number II

[匿名]

2012-08-10 1:54 am

Im stuck on this would appreciate any help
http://i47.tinypic.com/5jsf0j.jpg
For Q8, Ive no idea how to present my working
For Q9b and Q10c,Ive no idea how to calculate the value of z
Thanks

更新1:

how do u know 5cosΘ+4=0?

更新2:

for 9b, z is only (2+√3)+3i

回答 (1)

用戶25975

2012-08-10 5:04 pm

✔ 最佳答案

圖片參考：http://i1191.photobucket.com/albums/z467/robert1973/Aug12/Crazycmplx4.jpg
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2012-08-13 10:36:16 補充：
arg (z + 4) = 0, meaning that z + 4 is purely imaginary and hence its real part 4 + 5 cos θ = 0

2012-08-13 10:46:35 補充：
For 9a, (2+√3)+3i is the only ans which can be explained in the Argend diagram below:
http://i1191.photobucket.com/albums/z467/robert1973/Aug12/Crazycmplx5.jpg

參考: 原創答案

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