Results 1 to 2 of 2

Math Help - Rewriting equation

  1. #1
    Senior Member
    Joined
    Feb 2008
    Posts
    383

    Rewriting equation

    2^x+28*(2^{-x})=11<br />

    show how this can be rewritten as

    (2^x)^2-11*2^x+28=0

    thanks
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Super Member
    earboth's Avatar
    Joined
    Jan 2006
    From
    Germany
    Posts
    5,812
    Thanks
    116
    Quote Originally Posted by BabyMilo View Post
    2^x+28*(2^{-x})=11<br />

    show how this can be rewritten as

    (2^x)^2-11*2^x+28=0

    thanks
    2^x+28*(2^{-x})=11~\implies~2^x+\dfrac{28}{2^x}-11=0<br />

    Now multiply both sides of the equation by 2^x and you'll get the given result at once.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Rewriting an equation.
    Posted in the Algebra Forum
    Replies: 5
    Last Post: March 31st 2010, 07:01 PM
  2. Rewriting Equation
    Posted in the Calculus Forum
    Replies: 1
    Last Post: August 30th 2009, 10:24 AM
  3. Rewriting an equation into the form of Sin(a+b)
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: May 27th 2009, 05:46 AM
  4. Rewriting an equation
    Posted in the Algebra Forum
    Replies: 2
    Last Post: October 23rd 2008, 09:22 AM
  5. Rewriting function equation
    Posted in the Pre-Calculus Forum
    Replies: 5
    Last Post: April 8th 2007, 10:16 PM

Search Tags


/mathhelpforum @mathhelpforum