Results 1 to 4 of 4

Math Help - Advanced functions question please help!

  1. #1
    Junior Member
    Joined
    Mar 2010
    Posts
    56

    Advanced functions question please help!

    Question:

    An open-top box is to be contructed from a piece of cardboard by cutting congruent squares from the corners and then folding up the sides.
    I have already figured out the rest of the questions pertaining to.. except for the last part:

    D) Using your function V= x(32-2x)(40-2x);
    determine the values of "x" that will result in boxes with a volume greater than 2016 cm^3
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Master Of Puppets
    pickslides's Avatar
    Joined
    Sep 2008
    From
    Melbourne
    Posts
    5,236
    Thanks
    28
    Solve x(32-2x)(40-2x)> 2016
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Junior Member
    Joined
    Mar 2010
    Posts
    56
    thanks for answering.. but more specifically?

    my teacher is clueless and im trying to learn this on my own..

    i have the answer as " apprx. 2 < x < 10.9 or x >23.1 "

    but i dont know how to get there
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Flow Master
    mr fantastic's Avatar
    Joined
    Dec 2007
    From
    Zeitgeist
    Posts
    16,948
    Thanks
    5
    Quote Originally Posted by advancedfunctions2010 View Post
    thanks for answering.. but more specifically?

    my teacher is clueless and im trying to learn this on my own..

    i have the answer as " apprx. 2 < x < 10.9 or x >23.1 "

    but i dont know how to get there
    Note that x(32-2x)(40-2x) - 2016 can be factorised as 4(x - 2) (x^2 - 34x+252) so you should be able to exactly solve x(32-2x)(40-2x) - 2016 = 0. A rough sketch graph of y = x(32-2x)(40-2x) - 2016 can then be used to solve the required inequality.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Advanced Functions Logarithms
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 24th 2011, 05:31 PM
  2. Advanced functions question help
    Posted in the Algebra Forum
    Replies: 5
    Last Post: March 24th 2009, 11:31 AM
  3. Advanced functions review question help !
    Posted in the Algebra Forum
    Replies: 1
    Last Post: January 4th 2009, 05:38 PM
  4. Advanced functions
    Posted in the Pre-Calculus Forum
    Replies: 7
    Last Post: October 15th 2007, 04:21 AM
  5. advanced functions
    Posted in the Calculus Forum
    Replies: 1
    Last Post: August 9th 2007, 02:16 PM

Search Tags


/mathhelpforum @mathhelpforum