The function in question is f(x)= x^4 -4x, and the interval of interest is [0,2].
The average rate of change of this function on [0,2] is given by:
f(2) - f(0) 2^4 - 4(2) - [0^4 - 4(0)]
--------------- = ----------------------------------- = 4
2-0 2
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