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: Rational expressions very simble, but hard for me

  1. Apr 2, 2008 #1
    [tex] \frac{5x-5y-bx+by}{5x-5y+bx-by} [/tex]

    i can't cancel anything

    i can't factor anything

    please help
  2. jcsd
  3. Apr 2, 2008 #2


    User Avatar
    Homework Helper

    do the same with b
  4. Apr 2, 2008 #3
    but the b's (x and y) doesn't cancel since they have two different signs
  5. Apr 2, 2008 #4


    User Avatar
    Science Advisor
    Homework Helper

    -bx+by=(-b)(x-y). (x-y) IS a factor of both the numerator and the denominator.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook