With f(x)= , what is f(1)? Put that into (f(x)- f(1))/(x-1). Once you've done that, you should be able to factor the numerator and cancel.

You are given the formula==============================

(b) Use the result from part (a) to compute the average rate of change from x = 1 to x = 2. Be sure to simplify.useit! x= 2 here. What is f(2)? What is f(1)? What is (f(2)- f(1))/(2- 1)? Or just use the formula you got in (a)!

Presumably by this time you have already calculated the f(1) and f(2) so you know the two points. In (b) you found the slope of this line! How do you find the equation of the line?==============================

(c) Find an equation of the secant line containing the points

(1, f(1)) and (2, f(2)).[

HERE IS THE FUNCTION:

f(x) = x^3 + x[/QUOTE]