Suppose that f(x) > 0 and g(x) > 0 for all x. What simple additional conditions (if
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(a) f(x) + g(x) is concave up for all x;
(b) f(x) ∙ g(x) is concave up for all x;
(c) f(g(x)) is concave up for all x?
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a f x gx fx gx Since fx 0 and g 0 for all x fx gx 0 for all x No a...View the full answer
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