# Question: uppose that a use interval notation to indicate where is...

###### Question details

uppose that

(A) Use interval notation to indicate where
is concave up.

**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 "{}" without
the quotation marks.

Concave up:

(B) Use interval notation to indicate where
is concave down.

Concave down:

(C) Find all inflection points of
. If there are no inflection points, enter -1000. If there are
more than one, enter them separated by commas.

Inflection point(s) at
=