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Rational Expressions

  1. Nov 12, 2009 #1
    1. The problem statement, all variables and given/known data
    x (squared) + x - 30
    x (sqaured) -3x + 2

    Find all numbers for which the rational expression is not defined.

    i know this is really easy stuff, but i have a hard time staying focused in math, and i have to always teach myself with the book, but sometimes the book isn't very informative.

    I have the answer, but don't know how to go about doing these problems. I know you like people to attempt them, but i don't even know where to begin after factoring the 30 .
    Last edited: Nov 12, 2009
  2. jcsd
  3. Nov 12, 2009 #2


    User Avatar
    Homework Helper

    When is a rational expression (a fraction) not defined? For what value is division impossible?
  4. Nov 12, 2009 #3
    0, i got in now though. thanks anyway.
  5. Nov 12, 2009 #4


    Staff: Mentor

    So for what x will x2 - 3x + 2 = 0? You need to factor this trinomial to answer that question.
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