$\"\"$

The polynomial equation is $\"\"$ .

Make a table of values.

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Observe the table:

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

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

Graph:

Graph the function $\"\"$ .

Plot the points obtained in the table.

$\"\"$

Observe the graph:

The function has relative maxima at $\"\"$ -coordinate $\"\"$ and it has relative minima at $\"\"$ -coordinate $\"\"$ .

$\"\"$

The function has relative maxima at $\"\"$ -coordinate $\"\"$ and it has relative minima at $\"\"$ -coordinate $\"\"$ .