Suppose that f ( x ) = 5 x 3 + 5 x . f ( x ) = 5 x 3 + 5 x
Suppose that
fxxxfxxx
A Find all critical values offf. If there are no critical values, enter If there are more than one, enter them separated by commas.
Critical values
B Use interval notation to indicate where fxfx is increasing.
Note: When using interval notation in WeBWorK, you use I for I for and U for the union symbol. If there are no values that satisfy the required condition, then enter
Increasing:
C Use interval notation to indicate where fxfx is decreasing.
Decreasing:
D Use interval notation to indicate where fxfx is concave up
Concave up:
E Use interval notation to indicate where fxfx is concave down.
Concave down:
F Find all inflection points of ff If there are no inflection points, enter If there are more than one, enter them separated by commas.
