Algebra functions

[sugannanjappa]

Can someone please help me out in finding the solution and explanation for the following function problem.

For which of the following functions does f(a+b)=f(a)+f(b)?

(a)f(x)=x*x
(b)f(x)=x+1
(c)f(x)=square root of x
(d)f(x)=2/x
(e)f(x)=-3x

[tim]

As per the forum rules, we need a verifiable source for the problem before we can deal with this question. If the question is not one of ours or one that is copyright-free, we will have to delete the question..

Before we help with this question, we need you to show some effort of your own. What did you try on this question? Where did you get stuck?

[sugannanjappa]

Thanks for the reply.

This problem appears in GMAT prep2 software.
Considering a+b as x and I tried to switch a+b in all places of x but I am clueless how to solve this problem.
Please help me out.

[tim]

Next time, please post your question in the appropriate forum. We have a forum for GMAT Prep questions. As for this question, what results did you get when you plugged in a+b, a, and b for x?

[sugannanjappa]

Definitely will post on the right forum, thanks.

[tim]

Cool. Did you want any further help on this problem?