Determine
graph of f is increasing.
all intervals on which the
-9 -8
-6 -5 -4 -3 -2 -1
8
7
6
5
4
2
1
-1
y
-2
-3
-4
-5
-6
-7
-8
1
2
3
4
5
6
Graph of f
7 8
9
X