Determine the Maximum Possible Number of Turning Points for the Graph

question 47

Multiple Choice

Determine the maximum possible number of turning points for the graph of the function.
- $$f ( x ) = 5 x ^ { 8 } - 8 x ^ { 7 } - 9 x - 25$$

• A) 8
• B) 5
• C) 0
• D) 7