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November 6th, 2009, 09:59 PM
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| |  quadratic formula problem
 i got this far but now this is wrong answer any help would be great  |
November 6th, 2009, 10:07 PM
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Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top. |
November 6th, 2009, 10:13 PM
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Quote:
Originally Posted by Debsta  Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top. |
is this what you mean  |
November 6th, 2009, 10:15 PM
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Yep! |
November 6th, 2009, 10:17 PM
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Then you can factorize  and simplify. |
November 6th, 2009, 10:19 PM
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1
Last edited by Debsta; November 6th, 2009 at 10:30 PM.
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November 6th, 2009, 10:21 PM
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2
Last edited by Bacterius; November 6th, 2009 at 10:43 PM.
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November 6th, 2009, 10:24 PM
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Hey Bacterius,
For future reference, how do you self-delete things that you wish you hadn't posted. Hasn't happened to me yet, but I'm sure it will. | | The following users thank Debsta for this useful post: | |  |
November 6th, 2009, 10:24 PM
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Quote:
Originally Posted by Debsta What the? 7^2 = 49 not 28 ???? | 2^2-4x(-2)x3 =28 |
November 6th, 2009, 10:26 PM
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Quote:
Originally Posted by Debsta What the? 7^2 = 49 not 28 ???? | i dont get how you get this can u please explain
and to delete a comment you select edit then delete (not sure if that was sarcasm) |  | | The following users thank realistic for this useful post: | | |
November 6th, 2009, 10:27 PM
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Yep. You're right... I was responding to Bacterius. All you have to do now is factorise out the 2 and cancel and you're done. |
November 6th, 2009, 10:28 PM
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7
Last edited by Bacterius; November 6th, 2009 at 10:43 PM.
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November 6th, 2009, 10:32 PM
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thats the answer but i cant see how cancelling out gets that  
where did the positive 2 go? |
November 6th, 2009, 10:33 PM
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Quote:
Originally Posted by Bacterius Forget this Realistic, it's my stupidity. You got it right.
Debsta, I don't know, I have some quickly-posted things I want to clear but can't find the delete command ... I'll have to look in the FAQ.
EDIT : I've seen you can't delete your threads because of various reasons. I guess the same goes for posts ... what if I really want to remove the evidence ? | dont worry i really appreciate all the help |
November 6th, 2009, 10:33 PM
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Thanks, Realistic. I successfully deleted my earlier comment.
Wasn't sarcasm before - a serious question
BTW your final answer is [1 +/- sqrt(7)]/2. | | Thread Tools | | | | Display Modes |  Linear Mode | 
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