I believe you meant f(x) = x^2 - 3x - 10. f(b) - f(a) The ave. r. of c. formula is a. r. c = ----------------- b -a (6)^2 - 3(6) - 10 - [(4)^2 - 3(4) - 10] Here, a. r. c. = ------------------------------------------------------ 6-4 36 - 18 -10 - 16 + 12 + 10 ... which comes out to --------------------------------------- 2
a. r. c. = 7 for x^2 - 3x - 10 on the interval [4,6]