Using the Derivative of F(x) Given Below, Determine the Intervals $$f ^ { \prime } ( x ) = ( 1 - x ) ( 9 - x )$$

Multiple Choice

Using the derivative of f(x) given below, determine the intervals on which f(x) is increasing or decreasing.
- $$f ^ { \prime } ( x ) = ( 1 - x ) ( 9 - x )$$

A) Decreasing on $( - \infty , - 1 ) \cup ( - 9 , \infty )$ ; increasing on $( - 1 , - 9 )$
B) Decreasing on $( - \infty , 1 ) \cup ( 9 , \infty )$ ; increasing on $( 1,9 )$
C) Decreasing on $( 1,9 )$ ; increasing on $( - \infty , 1 ) \cup ( 9 , \infty )$
D) Decreasing on $( - \infty , 1 )$ ; increasing on $( 9 , \infty )$