The function f(x) is shown on the graph. What is f(o)?
15
O 12 only
O2 and 3 only
O-2, -1, 1, and 2 only
O-2, -1, 1, 2 and 12
1
12
fext
-7 6 5 4 3 ² 1
4 5 6 7 X
6+
-9+
-12 +
-15