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Let f(x) = x3 - 3 a2x 4 + a3
where a is some positive constant.
a. Find f(0), f( - 2a), f(a), f(2a). Then argue that the function has 3 roots.
b. Find the intervals where f(x) is increasing and the intervals where f(x) is decreasing. Your answer will depend on a. (Hint: Treat a as a constant when you differentiate. For instance, the derivative of -3a2x is -3a2.)
c. Find the intervals where f(x) is concave up and where it is concave down.
d. Sketch a qualitatively accurate picture of the graph.
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