Results 1 to 6 of 6

Math Help - Quadratic Equations problem

  1. #1
    Newbie
    Joined
    Feb 2010
    Posts
    23

    Unhappy Quadratic Equations problem

    1. The length of a rectangle is 3 cm less than twice the width. The area is 20cm^2. Find the dimensions of the rectangle.

    Thank you for you help!!
    Last edited by needhelpplease1; March 22nd 2010 at 05:31 PM. Reason: spelling
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    Joined
    Aug 2007
    From
    USA
    Posts
    3,110
    Thanks
    2
    I'll just assume you meant "rectangle". You are very welcome. What's your plan for a solution?

    I'll get you started:

    W = The width of the rectangle. THAT was important. What's next?
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2010
    Posts
    23

    thanks for your help

    Quote Originally Posted by TKHunny View Post
    I'll just assume you meant "rectangle". You are very welcome. What's your plan for a solution?

    I'll get you started:

    W = The width of the rectangle. THAT was important. What's next?
    OOPS, yes I meant rectangle. Ok well, if W = width, then Length = w - 3

    so I am thinking the solution would be (w)(w-3) = 20...
    Follow Math Help Forum on Facebook and Google+

  4. #4
    MHF Contributor
    Joined
    Aug 2007
    From
    USA
    Posts
    3,110
    Thanks
    2
    So close!

    Three things:

    1) No, that is not a solution, unless you mean a solution to setting it up. That is almost the right equation

    2) Read the problem statement again. Just "-3"? Or is there a "2x" in there somewhere?

    3) There is a very important point about the right hand side - a point often discarded as a mere formality. It is not a mere formality. It WILL save us. See if you can find it.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2010
    Posts
    23

    Unhappy i don't know

    Quote Originally Posted by TKHunny View Post
    So close!

    Three things:

    1) No, that is not a solution, unless you mean a solution to setting it up. That is almost the right equation

    2) Read the problem statement again. Just "-3"? Or is there a "2x" in there somewhere?

    3) There is a very important point about the right hand side - a point often discarded as a mere formality. It is not a mere formality. It WILL save us. See if you can find it.
    I dont know how else to do it please just tell me how, I have a quiz tomorrow...
    Follow Math Help Forum on Facebook and Google+

  6. #6
    MHF Contributor
    Joined
    Aug 2007
    From
    USA
    Posts
    3,110
    Thanks
    2
    Well, if you can't read the problem statement accurately, you're toast.

    Maybe you'll still manage to get the right answer without the units, but it will be less likely to occur.

    No need to panic. Stop. Take a deep breath. Exhale. Keep breathing, slowly and evenly. Now think about what you are doing. Read the problem statement until you get everything that is hiding in there. If you miss pieces and panic, you are not likely to do well on your quiz.

    Good luck. You'll need it. Take more time for honest study and exploration on the next quiz.
    Last edited by TKHunny; March 22nd 2010 at 06:47 PM. Reason: More polite, maybe...
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. A problem on quadratic equations .
    Posted in the Algebra Forum
    Replies: 2
    Last Post: September 26th 2011, 08:39 AM
  2. Quadratic Equations- Word Problem
    Posted in the Algebra Forum
    Replies: 3
    Last Post: November 19th 2010, 02:03 AM
  3. [SOLVED] Quadratic equations problem
    Posted in the Algebra Forum
    Replies: 2
    Last Post: August 7th 2010, 12:45 PM
  4. Replies: 2
    Last Post: January 29th 2009, 12:50 PM
  5. Factorising Quadratic Equations Problem
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 3rd 2008, 08:43 AM

Search Tags


/mathhelpforum @mathhelpforum