Find the Limit as X Approaches C of the Average $$f ( x ) = 3 x ^ { 2 } + 39 x$$

Multiple Choice

Find the limit as x approaches c of the average rate of change of the function from c to x.
-c = 3; $$f ( x ) = 3 x ^ { 2 } + 39 x$$

A) 108
B) 57
C) 30
D) 90