Results 1 to 3 of 3

Math Help - Strange number in otherwise normal equation

  1. #1
    Banned
    Joined
    Sep 2009
    Posts
    21

    Strange number in otherwise normal equation

    Greetings, I have an example of a question and answer I am trying to use to understand how to do this type of problem. But I can't understand where they are getting the number 0.21h! Please see attachment for full problem. Thanks so much!
    Attached Thumbnails Attached Thumbnails Strange number in otherwise normal equation-calc_wtf_1.png  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    MHF Contributor
    skeeter's Avatar
    Joined
    Jun 2008
    From
    North Texas
    Posts
    11,742
    Thanks
    482
    -0.001(105+h)^2<br />

    square the binomial, note the pattern ... \textcolor{red}{(a+b)^2 = a^2 + 2ab + b^2}

    -0.001(105^2 + 2(105)h + h^2)

    -0.001(11025 + 210h + h^2)

    -(11.025 + 0.21h + 0.001h^2)
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Banned
    Joined
    Sep 2009
    Posts
    21
    Thank you ever so much! I learned something long forgotten, you're the best!
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Strange equation
    Posted in the Math Puzzles Forum
    Replies: 6
    Last Post: January 22nd 2011, 09:28 AM
  2. Strange equation
    Posted in the Differential Equations Forum
    Replies: 3
    Last Post: May 24th 2010, 03:52 PM
  3. Very strange critical number problem...
    Posted in the Calculus Forum
    Replies: 6
    Last Post: May 1st 2009, 07:15 AM
  4. Strange critical number problem
    Posted in the Calculus Forum
    Replies: 4
    Last Post: February 18th 2009, 04:32 AM
  5. Strange equation
    Posted in the Advanced Math Topics Forum
    Replies: 3
    Last Post: October 28th 2005, 01:21 PM

Search Tags


/mathhelpforum @mathhelpforum