Calculate the average rate of change for the given function, from x = 8 to x = 5.

There is no "rate of change on (-6,2) ". The average rate of change of a function f on an interval [a, b] is f (b) - f (a) b-a example, given a function like f (x) = x2 + 5, we can find the average rate of change on [-6,2] by finding

f (2) - f (-6) 2 - (-6) = (9) - (41) 8 = - 328 = - 4