SOLUTION: what is the average rate of change of f(x)= -2/x^2 from x=1 to x=2?

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Question 1135658: what is the average rate of change of f(x)= -2/x^2 from x=1 to x=2?
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
what is the average rate of change of f%28x%29=+-2%2Fx%5E2 from x=1 to x=2?
All you need to find is :
%28f%282%29-f%281%29%29%2F%282-1%29
f%281%29=+-2%2F1%5E2=-2
f%282%29=+-2%2F2%5E2=-2%2F4=-1%2F2
then: