Quandaries
and Queries 

Jim Student Secondary Level Questions I just want to check a couple average rate of change problems because i just guessed on how to do them. Can you tell me how to do them? the question says if f(x) = sqrt(x + 3), find f( x + rx). I got sqrt( x + rx + 3) the other two are : f(x)= 3x1 (f(x)  f(1)) / (x1) ... I GOT 3 & f(x)= x^{3}  x (f(x)  f(1)) / (x1) ... I GOT x^{2} + x 

Hi Jim, I got the same answer as you for all three problems. I can show you what I did in the second and third problems. If f(x) = 3x  1 then
and hence
If f(x) = x^{3}  x then
and hence
Penny 

