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Math Help - Limits!! please help!

  1. #1
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    Limits!! please help!

    lim (x^2 -2x -3)
    x->3


    lim (x-3)(x+1)
    x->3

    (3-3) (3+1)



    because its (0) (4).. im not sure whether to times them together so its x=0 or just leave them as x=0 and x=4
    thanks
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  2. #2
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    Quote Originally Posted by fvaras89 View Post
    lim (x^2 -2x -3)
    x->3


    lim (x-3)(x+1)
    x->3

    (3-3) (3+1)



    because its (0) (4).. im not sure whether to times them together so its x=0 or just leave them as x=0 and x=4
    thanks
    I don't see the trouble here. The value of the limit is 3^2 -2(3) - 3 = 0. That's it. No need for factorsing etc.
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  3. #3
    Senior Member pacman's Avatar
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    yeah, very tempting to factor, but useless afterward because it can be evaluated directly by substitution.
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