Find the average rate of change of the function from x1 to x

Find the average rate of change of the function from x_1 to x-2 f(x) = x^2 + 2x from x_1 = 3 to x_2 = 5 A 10 B 15 C 4 D 25

Solution

Average rate of change of function in the range (a,b) is

A = f(b) - f(a) / b-a

f(a) and f(b) are the value of the function f(x) at the range \'a\' and \'b\'.

A = [5^2 + 2*5 ] - [3^2 - 2*3] / [5-3] = 10

Answer is 10