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: Factor expression A so that it looks like expression B

  1. Oct 11, 2012 #1
    1. The problem statement, all variables and given/known data
    This question stems from this one: https://www.physicsforums.com/showthread.php?t=642712

    I think I know how to solve it now. The only problem is I have to show how to factor this expression in to the form WolframAlpha shows.

    [itex]-a^2 b + a b^2 + a^2 c - b^2 c - a c^2 + b c^2[/itex] → [itex]-(a-b)(a-c)(b-c)[/itex]
    2. Relevant equations
    3. The attempt at a solution

    I did this but then I don't know how to proceed.


    Please help. Thanks
  2. jcsd
  3. Oct 11, 2012 #2
    By rearranging it like so:
    [itex]−a^2b+ab^2+a^2c−b^2c−ac^2+bc^2 \rightarrow −a^2b+a^2c+ab^2−ac^2−b^2c+bc^2 [/itex]
    Last edited: Oct 11, 2012
  4. Oct 11, 2012 #3
    You're a genius! Thank you. :)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook