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Math Help - quadratic formula problem

  1. #16
    Super Member Bacterius's Avatar
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    You're not cancelling that out. You are done, this is the answer.
    Sometimes you have to accept having big bad answers.
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  2. #17
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    Quote Originally Posted by Debsta View Post
    Thanks, Realistic. I successfully deleted my earlier comment.
    Wasn't sarcasm before - a serious question
    BTW your final answer is [1 +/- sqrt(7)]/2.
    Factorise 2 out of the top to get 2(-1 +/- sqrt(7)) on top, then cancel 2 top and bottom.
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  3. #18
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    Quote Originally Posted by Debsta View Post
    Factorise 2 out of the top to get 2(-1 +/- sqrt(7)) on top, then cancel 2 top and bottom.
    Ah you factorized the top bit thats what i was missing

    cause i kept getting this answer

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  4. #19
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    Bacterius, Go back to your comment. Hit edit and just delete everything. You don't seem to be able to clear evrything cause it sats your message is too short...so I just hit a key. Must be a better way. BTW your earlier comment re sqrt(28)=7 isn't there anymore anyway ...where'd it go?

    Glad you got it now Realistic. Hope that helped.
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  5. #20
    Super Member Bacterius's Avatar
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    Yes you factorize the top part, so the 2 next to the root gets eliminated and the -2 becomes -1

    Debsta, concerning my root error ... well I erased it 1 second after I sent the comment (I read it while page was loading) ... I wonder how you managed to read it
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