posted by Anonymous .
Let f be defined as follows.
y = f(x) = x^2 - 4 x
(a) Find the average rate of change of y with respect to x in the following intervals.
from x = 5 to x = 5.5
For some reason I keep getting this wrong. The way I did it was: f((5.5)-f(5))/(x2-x1)= 22-5/5.5-5=34 This is wrong, could someone show me what I'm doing wrong?
for f(5.5) I got 8.25
You probably had a typo in the formula, which should read:
( f(x2)-f(x1) ) / ( x2-x1 )
For the interval [5,5.5]
Post again if you still have problems.