calculus

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3. For what value of k will x+k/x have a relative maximum at x = -2?

A. -4 B. -2 C. 2 D. 4 E. None of these

  • calculus -

    y = x + k/x
    y' = 1 - k/x^2

    1 - k/x^2 = 0
    1 - k/4 = 0
    k = 4

    (D)

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