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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 .
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The -intercept of the graph is .
This means .
Substitute in .
Therefore, possible polynomial function is .
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