Consider the function below. (If an answer does not exist, enterDNE.)
f(x) =
x4 − 4x2 + 2
(a) Find the interval of increase. (Enter your answer usinginterval notation.)
(−2,0)∪(2,∞)
 Â
Find the interval of decrease. (Enter your answer using intervalnotation.)
(−∞,−2)∪(0,2)
 Â
(b) Find the local minimum value(s). (Enter your answers as acomma-separated list.)
DNE
 Â
Find the local maximum value(s). (Enter your answers as acomma-separated list.)
2
 Â
(c) Find the inflection points.
| (x, y) | = | Â Â (smaller x-value) |
| (x, y) | = | Â Â (larger x-value) |
Find the interval where the graph is concave upward. (Enter youranswer using interval notation.)
Find the interval where the graph is concave downward. (Enter youranswer using interval notation.)
