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Math Help - slope question - finding when a line is tangent to a curve

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    Exclamation slope question - finding when a line is tangent to a curve

    can anyone answer the question on the pic.....
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    Last edited by mr fantastic; October 17th 2009 at 05:55 PM.
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    Quote Originally Posted by Sneaky View Post
    can anyone answer the question on the pic.....
    Solve the following two equations simultaneously for c:

    \frac{c}{2 \sqrt{x}} = \frac{1}{2} .... (1)

    c \sqrt{x} = \frac{1}{2} x + \frac{9}{2} .... (2)

    (Your other job, apart from solving these two equations, is to think about where they have come from).
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