$\"\"$

The polynomial equation is $\"\"$ .

Make a table of values.

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

Observe the table: \ \

There is only one sign change.

Since $\"\"$ is a fourth degree polynomial, since it has either $\"\"$ or $\"\"$ real zeros.

The change in sign indicates that there is a zero between $\"\"$ and $\"\"$ and $\"\"$ and $\"\"$ .

Graph:

Graph the function $\"\"$ .

Plot the points obtained in the table

$\"\"$ \ \

$\"\"$

Graph the function $\"\"$ .

$\"\"$