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11-19-2008, 06:04 PM
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| |  Quadratic equation
A quadratic equation x^2 + bx + c = 0 has complex roots 3+6i and 3-6i. Find the values of b and c.
Thank you for any help! |
11-19-2008, 06:09 PM
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Quote:
Originally Posted by live_laugh_luv27  A quadratic equation x^2 + bx + c = 0 has complex roots 3+6i and 3-6i. Find the values of b and c.
Thank you for any help! | hint: the coefficients of the x-squared term in the quadratic is 1, thus the quadratic is given by  , where  and  are the two roots of the equation
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11-19-2008, 06:19 PM
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Quote:
Originally Posted by Jhevon hint: the coefficients of the x-squared term in the quadratic is 1, thus the quadratic is given by , where and are the two roots of the equation |
So, would you do (1-(3+6i )) and (1-(3-6i))?? |
11-19-2008, 06:21 PM
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Originally Posted by live_laugh_luv27 So, would you do (1-(3+6i )) and (1-(3-6i))?? | i have no idea how you got that
to follow up on what i said, start with 
now multiply out and you can find b and c
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11-19-2008, 06:25 PM
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Quote:
Originally Posted by Jhevon i have no idea how you got that
to follow up on what i said, start with
now multiply out and you can find b and c |
Thank you so much for your help!! |
11-19-2008, 06:28 PM
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Originally Posted by live_laugh_luv27 Thank you so much for your help!! | you're welcome 
state your answer when done
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11-19-2008, 06:29 PM
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Quote:
Originally Posted by Jhevon you're welcome
state your answer when done | b = -9, c=45 |
11-19-2008, 06:33 PM
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Originally Posted by live_laugh_luv27 b = -9, c=45 | b is incorrect
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11-19-2008, 06:36 PM
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-6 !!!!!!!!!!! |
11-19-2008, 06:37 PM
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Originally Posted by live_laugh_luv27 -6 !!!!!!!!!!! | um, yes...!!!!!!!!!!!!
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