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Math Help - One sided limit

  1. #1
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    One sided limit

    Hello!

    I got a problem understanding this function
    g(x) = -2x+4x, x < -1
    13, x = -1
    2x^3+3, -1 < x

    what is the
    lim g(x) ?
    x-> (-1)-

    I found it equals to 1, since 2(-1)^3+3 = 1.
    but apparently, it is incorrect. how come?
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  2. #2
    MHF Contributor

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    You are looking at the wrong side of -1.
    \lim _{x \to  - 1^ -  } \text{  means }x <  - 1
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