J ++jan_H++ New Member Joined Aug 16, 2005 Messages 10 Gender Undisclosed HSC 2006 Feb 20, 2006 #1 i know that is a easy Q ..... but i still can;t do it ..... whatever how many time i did .... still could;t get the answer ......... solve Z^4-2Z^2+4=0....thx
i know that is a easy Q ..... but i still can;t do it ..... whatever how many time i did .... still could;t get the answer ......... solve Z^4-2Z^2+4=0....thx
.ben Member Joined Aug 13, 2005 Messages 492 Location Sydney Gender Male HSC 2006 Feb 20, 2006 #2 let u=z2 then use quadratic forumala
R Riviet . Joined Oct 11, 2005 Messages 5,593 Gender Undisclosed HSC N/A Feb 20, 2006 #3 Yep, that's what I would do, you should get z=+sqrt(1+isqrt3)
J ++jan_H++ New Member Joined Aug 16, 2005 Messages 10 Gender Undisclosed HSC 2006 Feb 20, 2006 #4 get it now.... thx guy ...
