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Math Help - need to find this limit:

  1. #1
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    need to find this limit:

    Its actually been a while since I've done limits. I dont know how to handle this.

    Lim
    x---> 0 (-3/x) + (20/x^2) - (210/x^3) + (3024/x^4)

    I think I need to do something with natural logs but I dont really remember how to do a problem like this(if its even possible)
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  2. #2
    Member
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    I'm thinking you could change it into one big fraction, and then look at the highest power of the top and bottom. Since the degree of the function on the bottom is higher, then the limit as x goes to 0 is infinity.
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  3. #3
    MHF Contributor Calculus26's Avatar
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    Combine into the single expression

    [-3x^3 +20x^2 -210x+3024]/x^4

    lim x->0+ = 3024/0-> inf since x^4 >0 as x->0+

    lim x->0- = 3024/0 -> inf since x^4 > 0 as x->0-

    therefore lim x->0 f(x) = infinity
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