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Math Help - Limits and functions

  1. #1
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    Limits and functions

    Okay I have 2 questions.

    If f(x)=2x^2+3x+5

    Find


    and

    If
    <br /> <br />
f(x)=-(25/2x+3)<br /> <br />

    Find



    Answers could be

    A 2
    B 3
    C +infinity
    D 1
    E Does Not Exist
    F 0
    G 4
    H None of the above

    I've tried and asked my friends and no one knows how to start this.
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  2. #2
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    Quote Originally Posted by tofuwrice View Post
    Okay I have 2 questions.

    If f(x)=2x^2+3x+5

    Find


    [snip]
    Start by getting an expression for f(h). Then get f(0). Then get f(h) - f(0) and simplify. Then divide the result by h. Then take the limit. Alternatively, recognise the value of the limit as f'(0).


    Quote Originally Posted by tofuwrice View Post
    [snip]
    If


    Find



    Answers could be

    A 2
    B 3
    C +infinity
    D 1
    E Does Not Exist
    F 0
    G 4
    H None of the above

    I've tried and asked my friends and no one knows how to start this.
    See the approach I advised for the first question. Alternatively, recognise the value of the limit as f'(1).
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