et - 2x² +1
-2. Which
of the following are all the intervals on which the graph off is concave down?
A. (-0.418, 0.418) only
B. (-1, 1) only
C. (-1.354,-0.409) and (0.409, 1.354)
D. (-1.5, -1) and (0, 1)
E. (-1.5, -1.354), (-0.409, 0), and (1.354, 1.5)
