Let f(x)=x2+3x+2 .
What is the average rate of change of f(x) from 3 to 6?
Kinda' like the last one....we want to find
[ f(6) - f(3) ] / [ 6 - 3 ] =
[ (6)^2 + 3(6) + 2 - ( (3)^2 + 3(3) + 2 ) ] / 3 =
[ 36 + 18 + 2 - 9 - 9 - 2 ] / 3 =
[ 36] / 3 = 12
+523 
