Try another version of this question Given `f(x) = x^2 + 11 x `, find the average rate of change of `f(x)` on the interval `[5, 5+h]`. Your answer will be an expression involving `h`.
Box 1: Enter your answer as an expression. Example: 3x^2+1, x/5, (a+b)/c
Start by substituting `5` and `5 + h` into `f(x)`. Then, input the values into the rate of change formula `(y_2 - y_1)/(x_2 - x_1)`.
Be sure your variables match those in the question `21 + h`