Critical numbers of functions
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The solution shows how to determine critical numbers and concavity of a given function.
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(a) f(x) = (x/3)(x - 3)2/3
f'(x) = (1/3)[x*(2/3)(x - 3)-1/3 + (x - 3)2/3] = 0
or (2x/3)(x - 3)-1/3 + (x - 3)2/3 = 0
or (2x/3) + ...
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