The Attempt at a Solution
How did you get that?
Now how about d and e?
Here's a clue...
What is the shape of the graph when the derivative is zero?
I'm sorry, but I don't get (-1,3) for increasing...
The derivative is this, as you have written, correct?
Ignore the denominator... where is the numerator zero? Where are each of the three components zero?
I said ignore the denominator... if the denominator is zero, your graph is really screwing up.
OK, so you know the graph of the derivative is zero at -1 and 1.
Thus, the minimum and the maximum must be at those two points.
Yes, exactly. The function isn't increasing at x=1/3 because it isn't defined there, so you have to split the interval as you have done.