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posted by H Sunday, December 25, 2011 at 4:02pm.
The value of c for which f(x) = x + c/x has a local minimum at x= 3 is (a) -9 (b) - 6 (c) -3 (d) 6 (e) 9
df/dx = 1 - c/x^2 = 0 If the minimum is at x = 3, then c/x^2 = c/9 = 1 c = 9
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