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Math Help - Solving this derivative

  1. #1
    Junior Member
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    Solving this derivative

    x + 1/x

    dy/dx =

    Solve for x

    1/x^2 = -1

    x^2 = -1 * -1

    x = + or - sqrt 1

    Is this correct? If so, I don't see how it works, as the answer only has a +1 as a stationary point coordinate. The other x is a 5, but I don't see how you'd get that.
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  2. #2
    Senior Member Spec's Avatar
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    Unless there's some information we're missing here, you are correct when you say that x=1 and x=-1 are the only stationary points.
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  3. #3
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    Well I was looking at the wrong answer heh.
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