Textbook charts are shitty. Used mainly when the degree of the function is non-linear. When the degree is more than one. If the degree is one, then use a Number line.
# Of Columns
To get the # of columns, cols = 2(# of critical points) + 2 so, if a graph has 2 X ints, then there are 6 columns
Example
-x(1+x) > 0 A chart looks like:
| test | x < -1 | x = -1 | -1 < x < 0 | x = 0 | x > 0 |
|---|---|---|---|---|---|
| -x(x+1) | - | 0 | + | 0 | - |
| It is greater than zero. This is very monotonous, if you know Bounce and Cross, than you can just guess. |