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Forums › Off topic › urgent math help rquired - inequalities


484 posts

Ultimate Geek

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Topic # 25352 19-Aug-2008 13:37
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Can someone solve these for me?

a)                   3 - 3x < -1b)                   -2(x+4) > 1 – 5xc)                   x – 1 < 2x + 2 < 3x + 1

Thanks!




For billions of years since the outset of time, every single one of your ancestors survived, every single person on your Mum and Dads side, successfully looked after and passed onto you life.  What are the chances of that like?

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268 posts

Ultimate Geek
+1 received by user: 49


  Reply # 158016 19-Aug-2008 15:05
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Expand the brackets. Move the x terms to one side, constants to the other by adding or subtracting from both sides. Simplify. Remove the coefficient from x by dividing both sides by it, paying special attention to the direction of the inequality if the coefficient is negative. Done.

---JvdL---

424 posts

Ultimate Geek
+1 received by user: 2


  Reply # 158027 19-Aug-2008 16:03
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If you are having other problems, I've found Yahoo answers pretty good (amongst the dross).



484 posts

Ultimate Geek

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  Reply # 158028 19-Aug-2008 16:05
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Thanks Jarno that gave me the memory jog I needed! Gee geekzone can be a fountain of knowledge! Smile




For billions of years since the outset of time, every single one of your ancestors survived, every single person on your Mum and Dads side, successfully looked after and passed onto you life.  What are the chances of that like?

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Wannabe Geek


  Reply # 158072 19-Aug-2008 18:21
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a) 3 -3x < -1
       -3x < -4
          x > 4/3


b) -2(x+4) > 1 -5x
    -2x -8  > 1 - 5x
    3x > 9
     x > 3


c)  x -1 < 2x +2 < 3x +1
    X +3 > 0   on te left
    x -1 > 0 on the right
   x > -3
   x > 1
 so x > 1

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