1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
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: Factorization formula

  1. Jul 28, 2007 #1
    1. The problem statement, all variables and given/known data

    Is there like a formula with a name easy to remember of which the following is a specific instance:

    x^200 -y^200 = (x-y)(x^199+x^198y+... + y^198*x + y^199)


    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jul 28, 2007 #2
    Not that I've ever heard...


    Sorry wouldn't fint onto one line...

    Maybe to can find a pattern to that mess though. If not, well, it took my calculator about 3 second to find the answer, might want to use one the next time you need to factor that...
    Last edited: Jul 28, 2007
  4. Jul 28, 2007 #3
    which calculator do you have? i been thinking about upgrading to a TI-89 ...
  5. Jul 28, 2007 #4
    Ti-89 Titanium
  6. Jul 28, 2007 #5


    User Avatar
    Science Advisor

    Do you mean
    [tex]x^n- y^n= (x-y)(x^{n-1}+ x^(n-2)y+ /cdot/cdot/cdot+ xy^{n-2}+ y^{n-1}[/tex]?
    I've never worried about it having a name!
  7. Jul 28, 2007 #6
    Yes. I just forget identities so easily when I have to remember them by their statement not some label. However, you're right, this is a pretty simple one that is easily verifiable and probably doesn't warrant a name!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook