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Math Help - I can't remember how to solve from first principles...

  1. #1
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    I can't remember how to solve from first principles...

    I can't remember how to solve from first principles...-screen-shot-2010-09-16-4.11.17-pm.png




    Thank you!
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  2. #2
    A Plied Mathematician
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    Try factoring the denominator. Or did you mean the delta-epsilon method?
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  3. #3
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    oooh.. thank you.
    1/14
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  4. #4
    A Plied Mathematician
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    Correct.
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  5. #5
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    For the future use of metaname90 (and anyone else): the only reason you cannot just put x= 4 into \frac{x- 4}{x^2+ 6x- 40} is because you get " \frac{0}{0}". And saying that x= 4 makes x^2+ 6x- 40= 0 tells you that x- 4 is a factor! Once you know that it should be easy to find the number, a, so that x^2+ 6x- 40= (x- a)(x- 4).
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