Finding the average rate of chang of f(x)=x2 -3 from x=2 to x=4. I know how to plug these in but what does it mean by find the average rate of change?

Algebra and Trigonometry (MindTap Course List)
4th Edition
ISBN:9781305071742
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter2: Functions
Section2.4: Average Rate Of Change Of A Function
Problem 4.1E: aThe average rate of change of a function f between x=a and x=b is the slope of the ___________ line...
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Finding the average rate of chang of f(x)=x2 -3 from x=2 to x=4.

I know how to plug these in but what does it mean by find the average rate of change?

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