Advanced Engineering Mathematics
10th Edition
ISBN: 9780470458365
Author: Erwin Kreyszig
Publisher: Wiley, John & Sons, Incorporated
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Determine the open intervals on which the graph is concave upward or concave downward. (Enter your answers using interval notation. If an answer does not exist, enter DNE.)
f(x) = x4 − 9x3
concave upward
concave downward
I need to find the answer for concave upward and concave downward.
Can you help me find it?
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