Observe the graph :

Since the graph has two turning points, the degree of the function is at least $\"\"$ .

The third degree polynomial should be in the form $\"\"$ .

The curve crosses the $\"\"$ - axis at $\"\"$ and $\"\"$ .

So the polynomial function has a real zeros at $\"\"$ and $\"\"$ .

If $\"\"$ is a real zero of a polynomial function $\"\"$ , then $\"\"$ is a factor of $\"\"$ .

Therefore, $\"\"$ and $\"\"$ are factors of $\"\"$ .

Thus, the polynomial function is $\"\"$ .

$\"\"$ .

The $\"\"$ -intercept of the graph is $\"\"$ .

This means $\"\"$ .

Substitute $\"\"$ in $\"\"$ .

$\"\"$

Therefore, possible polynomial function is $\"\"$ .

$\"\"$ .