Results 1 to 4 of 4

Math Help - How to solve these?

  1. #1
    Newbie
    Joined
    Aug 2009
    Posts
    6

    How to solve these?





    -Thanks.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Rhymes with Orange Chris L T521's Avatar
    Joined
    May 2008
    From
    Santa Cruz, CA
    Posts
    2,844
    Thanks
    3
    Quote Originally Posted by memento mori View Post




    -Thanks.
    For the first one, note that when you cross multiply, you get p(p-3)=40\implies p^2-3p=40\implies p^2-3p-40=0. This is now a quadratic equation which can easily be solved.

    For the second one, note that when you cross multiply, you get 3(2w-3)=5w\implies 6w-9=5w. This is now a linear equation which can easily be solved.

    For the third one, note that when you cross multiply, you get c(c-6)=7\implies c^2-6c=7\implies c^2-6c-7=0. This is now a quadratic equation which can easily be solved.

    Can you try to continue on from where I left off in each problem?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28
    You need to post your workings when asking for help on this forum. You also need to thank any post you find helpful.


     \frac{p}{4} = \frac{10}{p-3}

    p(p-3) = 4\times 10

    p^2-3p = 40

    p^2-3p - 40=0

    (p+5)(p-8)=0

    p=-5,8
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Newbie
    Joined
    Aug 2009
    Posts
    6
    Thank you both very much; it's now much easier for me to solve these sorts of problems. (I'll also keep that in mind, pickslides.)
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. need to solve summation equation to solve sum(x2)
    Posted in the Statistics Forum
    Replies: 2
    Last Post: July 16th 2010, 10:29 PM
  2. how do i solve this IVP: y'=y^2 -4
    Posted in the Differential Equations Forum
    Replies: 2
    Last Post: February 24th 2010, 11:14 AM
  3. Replies: 1
    Last Post: June 9th 2009, 10:37 PM
  4. how do i solve this?
    Posted in the Algebra Forum
    Replies: 2
    Last Post: August 2nd 2008, 02:58 PM
  5. how to solve ..
    Posted in the Advanced Algebra Forum
    Replies: 0
    Last Post: August 2nd 2008, 08:17 AM

Search Tags


/mathhelpforum @mathhelpforum