Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Algebraic manipulation

  1. Apr 22, 2010 #1
    1. The problem statement, all variables and given/known data

    Was just wondering how this equation:


    gets manipulated to produce this result

    [tex]20(3-d)^2=d^2 [/tex]


    2. Relevant equations

    3. The attempt at a solution

    I've tried manipulating it myself but it ends up with me spiraling off into pages of crap that is obviously wrong.
    Last edited: Apr 22, 2010
  2. jcsd
  3. Apr 23, 2010 #2
    Are you sure you typed that in right?

    Were you trying to say this?:
    (k*16*10-6)/d2 = (k*16*10-6)/(30-d)2

    If so, then first you would cancel the k expressions at the top, reciprocal both sides, expand and solve for d. However, I get a different result than what you give below.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook