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January 30, 2015

January 30, 2015

Posted by **Anonymous** on Friday, February 4, 2011 at 4:01pm.

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?

- Calculus -
**Reiny**, Friday, February 4, 2011 at 4:42pmfor f(5.5) I got 8.25

http://www.google.ca/search?hl=en&q=5.5%5E2+-+4*5.5&btnG=Search&aq=f&aqi=&aql=&oq=

- Calculus -
**MathMate**, Friday, February 4, 2011 at 9:24pmYou probably had a typo in the formula, which should read:

( f(x2)-f(x1) ) / ( x2-x1 )

For the interval [5,5.5]

(f(5.5)-f(5))/(5.5-5)

=(8.25-5)/(5.5-5)

=6.5

Post again if you still have problems.

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