In order to find the rate of change of a function between two points, you should use the formula, ( f (b) - f (a) ) / (b - a).
Using the formula;
= ( f (b) - f (a) ) / (b - a)
Where
b would be the second value of x and a would be the first value of x.
For instance, if you were to find the average rate of change in function:
y = 4x³ - 5x² + 1 in between x = -3 and x = 1.
The average rate of change would be:
= ( 4 (1)³ - 5(1)² + 1) - (4 (-3)³ - 5(-3)² + 1) / (1 - (3))
= 152 / 4
= 38
Find out more on the average rate of change of functions at https://brainly.com/question/7448057.
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