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Math Help - quadratic simplification of answers

  1. #1
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    quadratic simplification of answers

    -3x2-10x+12=0

    Here is what I'm shown as the solution:
    quadratic simplification of answers-screen-shot-2013-02-11-10.23.45-am.png

    What I don't understand is how the last two steps happen. I understand that 10/-6 reduces to -5/3, but not how sqrt(244) is 61? It it that sqrt(244) is sqrt(4*61)?

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  2. #2
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    Re: quadratic simplification of answers

    Quote Originally Posted by gzilnik View Post
    -3x2-10x+12=0

    Why are you not using the equivalent form?
    3x^2+10x-12=0
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  3. #3
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    Re: quadratic simplification of answers

    Alright, even if I do I still arrive at the same issue. The issue I run into is that I don't understand what is happening between here:
    quadratic simplification of answers-screen-shot-2013-02-11-1.59.05-pm.png
    and here:
    quadratic simplification of answers-screen-shot-2013-02-11-1.59.51-pm.png
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  4. #4
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    Re: quadratic simplification of answers

    Quote Originally Posted by gzilnik View Post
    Alright, even if I do I still arrive at the same issue. The issue I run into is that I don't understand what is happening between here:
    Click image for larger version. 

Name:	Screen Shot 2013-02-11 at 1.59.05 PM.png 
Views:	10 
Size:	8.2 KB 
ID:	26963
    and here:
    hi there! all what is happening is that root 244 can be simplified to root4 * root61 which is the same as 2*root61 and then the 2 would divide out with 6, just like the 10 and 6 thus resulting Click image for larger version. 

Name:	Screen Shot 2013-02-11 at 1.59.51 PM.png 
Views:	3 
Size:	8.8 KB 
ID:	26964
    Thanks from gzilnik and HallsofIvy
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