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Math Help - quadratic formula problem

  1. #1
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    quadratic formula problem

    i got this far but now this is wrong answer any help would be great
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  2. #2
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    Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top.
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  3. #3
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    Quote Originally Posted by Debsta View Post
    Your mistake is in your fourth line. Should be -2 +/- 2 sqt(7) on top.

    is this what you mean
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  4. #4
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    Yep!
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  5. #5
    Super Member Bacterius's Avatar
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    Then you can factorize 2 and simplify.
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    Last edited by Debsta; November 6th 2009 at 09:30 PM.
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  7. #7
    Super Member Bacterius's Avatar
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    Last edited by Bacterius; November 6th 2009 at 09:43 PM.
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  8. #8
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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.
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    Quote Originally Posted by Debsta View Post
    What the? 7^2 = 49 not 28 ????
    2^2-4x(-2)x3 =28
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    Quote Originally Posted by Debsta View Post
    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) |
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  11. #11
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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.
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  12. #12
    Super Member Bacterius's Avatar
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    Last edited by Bacterius; November 6th 2009 at 09:43 PM.
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  13. #13
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    thats the answer but i cant see how cancelling out gets that

    where did the positive 2 go?
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  14. #14
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    Quote Originally Posted by Bacterius View Post
    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
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  15. #15
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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.
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