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What defines an algebraic fraction

  1. Jul 17, 2008 #1
    O.k. I am trying to figure out what defines an algebraic fraction. I know it has something to do with the denominator but for the life of me I can not make any sense out of my text book examples. Like 3/2x = 0 I guess 3/x*x = 3 divided by no actual number which would be zero but that is the best I can work out after 4 hours of trying to do this section of my homework.
     
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  3. Jul 17, 2008 #2

    LowlyPion

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    Does this link help?

    http://www.themathpage.com/Alg/multiply-algebraic-fractions.htm
     
  4. Jul 17, 2008 #3

    HallsofIvy

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    An algebraic fraction, also caled a rational function, is one polynomial divided by another. The polynomials may be of several variables.
     
  5. Jul 18, 2008 #4
    O.k. if I have a^2-10a+21/a^2-11a+28 I then get 21/-1a+28 and then 3/-a+4 but my book says I should get a-3/a-4 How did that happen?
     
  6. Jul 18, 2008 #5

    LowlyPion

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    They are asking you to simplify the fraction. Factor the numerator and denominator and simplify.

    (PS: Their answer is right.)
     
  7. Jul 18, 2008 #6
    even with simplifying how do you get an a on both sides when their is an odd number of them to begin with?????
     
  8. Jul 18, 2008 #7

    LowlyPion

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    What both sides? You have an expression that is a fraction. You have a numerator and you have a denominator.

    After you have factored both equations (top and bottom) you still have an expression that is still an algebraic fraction. When the like terms are canceled top and bottom, you are still left with an algebraic expression - only it's the answer given.
     
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