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March 16th, 2019, 12:25 AM   #1
VKN
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Thumbs up 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.
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March 16th, 2019, 03:11 AM   #2
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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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