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Math Help - derivatives

  1. #1
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    derivatives

    let f be a differentiable function such that f(3)=2 and f`(3)=5. If the tangent line to the graph of f at x=3 is used to find an approximation to a zero of f, that approximation is??

    I have no idea what to do?
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  2. #2
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    Quote Originally Posted by gebbal View Post
    let f be a differentiable function such that f(3)=2 and f`(3)=5. If the tangent line to the graph of f at x=3 is used to find an approximation to a zero of f, that approximation is??

    I have no idea what to do?
    The equation of the tangent is

     y - f(3) = f'(3) (x-3)

    Find when this line crosses the x-axis.
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