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October 26th, 2013, 09:17 AM  #1 
Senior Member Joined: Sep 2010 From: Germany Posts: 153 Thanks: 0  solve quadratic equation
How to solve this? and I calculate delta how to proceed? 
October 26th, 2013, 09:30 AM  #2  
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: solve quadratic equation Quote:
Then:  
October 26th, 2013, 09:46 AM  #3  
Senior Member Joined: Sep 2010 From: Germany Posts: 153 Thanks: 0  Re: solve quadratic equation Quote:
 
October 26th, 2013, 10:20 AM  #4 
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: solve quadratic equation
You want to express z as a + bi for real numbers a and b. To help you do this, note that: 
October 26th, 2013, 11:52 AM  #5 
Math Team Joined: Sep 2007 Posts: 2,409 Thanks: 6  Re: solve quadratic equation
There are, of course, two complex numbers whose square is i. And since the complex numbers cannot be "ordered", we cannot assert that " is the positive one" as we do with real numbers. We must say that .

October 27th, 2013, 02:07 PM  #6 
Senior Member Joined: Jun 2013 From: London, England Posts: 1,316 Thanks: 116  Re: solve quadratic equation
Okay but 
October 27th, 2013, 02:32 PM  #7 
Math Team Joined: Jul 2011 From: North America, 42nd parallel Posts: 3,372 Thanks: 233  Re: solve quadratic equation 

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