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Math Help - Finding a slope of tangent line

  1. #1
    Member M670's Avatar
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    Finding a slope of tangent line

    Hey guys
    So what I really need help with is not finding the slope it's how do I combine the square root into the F(4+H) part of the derivative formula ?

    Let
    The slope of the tangent line to the graph of at the point is .
    The equation of the tangent line to the graph of at is for

    and
    .
    Hint: the slope is given by the derivative at , ie.
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  2. #2
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    Re: Finding a slope of tangent line

    Just substitute "4 + h" for "x" under the radical.
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  3. #3
    Member M670's Avatar
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    Re: Finding a slope of tangent line

    This question just doesn't seem to be working out... I calculated my derivative as 0 which means a slope of 0 .
    ?
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  4. #4
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    Re: Finding a slope of tangent line

    See the attachment. Try the conjugate in the Newton ratio. Remember x^2 - y^2 = (x - y)(x + y).
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