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March 16th, 2019, 12:25 AM  #1 
Newbie Joined: Mar 2019 From: India Posts: 1 Thanks: 0  can anyone help me with? FUNCTIONS?!
If f(x) satisfies f(x+y) = f(x) + f(y) for all x,y belonging to $\mathbb{R}$, and f(1) = 5, find $\!$ m $\displaystyle \sum$ [f(n)] n=1 Last edited by skipjack; March 16th, 2019 at 03:09 AM. 
March 16th, 2019, 03:11 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,370 Thanks: 2007 
Using x = y = 1, f(2) = f(1) + f(1) = 10. You can similarly calculate f(3), f(4), etc. Does that help?


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