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October 26th, 2013, 08:17 AM   #1
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solve quadratic equation

How to solve this?







and I calculate delta



how to proceed?
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October 26th, 2013, 08:30 AM   #2
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Re: solve quadratic equation

Quote:
Originally Posted by rayman
and I calculate delta



how to proceed?
It should be:



Then:

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October 26th, 2013, 08:46 AM   #3
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Re: solve quadratic equation

Quote:
Originally Posted by Pero

It should be:



Then:

Thank you, it was a typo. I have a question: don't we have to simplify it somehow? I am thinking of or is it the final answer?
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October 26th, 2013, 09:20 AM   #4
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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:

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October 26th, 2013, 10:52 AM   #5
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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 .
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October 27th, 2013, 01:07 PM   #6
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Re: solve quadratic equation

Okay but
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October 27th, 2013, 01:32 PM   #7
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Re: solve quadratic equation




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