Answer:
The maximum number of turns in the graph of f(x) is:
2
Explanation:
Turning Point of a graph--
The turning point of a graph is a point where the graph changes it's behavior i.e. it changes from increasing to decreasing and from decreasing to increasing.
The polynomial of degree n has atmost " n-1 " turning points.
Here we are given a polynomial f(x) as:

The polynomial is of degree 3.
Hence, the maximum number of turning points of the function f(x) is: 3-1=2