Find two points on the function: ((x_1, f(x_1))) and ((x_2, f(x_2)))
Use the formula: (dfrac{f(x_2)-f(x_1)}{x_2-x_1})
Subtract the y-values
Subtract the x-values
Divide the change in y by the change in x
Simplify the result
Check that (x_2 ne x_1)
Find two points on the function: ((x_1, f(x_1))) and ((x_2, f(x_2)))
Use the formula: (dfrac{f(x_2)-f(x_1)}{x_2-x_1})
Subtract the y-values
Subtract the x-values
Divide the change in y by the change in x
Simplify the result
Check that (x_2 ne x_1)