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# For which of the following functions is f(a + b) = f(a) + f(b)...

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Intern
Joined: 11 Jul 2017
Posts: 1
For which of the following functions is f(a + b) = f(a) + f(b)...  [#permalink]

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26 Jul 2017, 08:14
00:00

Difficulty:

(N/A)

Question Stats:

33% (00:49) correct 67% (00:52) wrong based on 3 sessions

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For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b?

A) f(x) = x^2
B) f(x) = x + 1
C) f(x) = \sqrt{x}
D) f(x) = 2/x
E) f(x) = -3x

Hoping for a little help with the solution on this one as I'm not following the thought process.

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Math Expert
Joined: 02 Sep 2009
Posts: 55271
Re: For which of the following functions is f(a + b) = f(a) + f(b)...  [#permalink]

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26 Jul 2017, 08:26
1
acquinn01 wrote:
For which of the following functions is f(a + b) = f(a) + f(b) for all positive numbers a and b?

A) f(x) = x^2
B) f(x) = x + 1
C) f(x) = \sqrt{x}
D) f(x) = 2/x
E) f(x) = -3x

Hoping for a little help with the solution on this one as I'm not following the thought process.

Discussed here: for-which-of-the-following-functions-is-f-a-b-f-a-f-b-for-93184.html

--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: For which of the following functions is f(a + b) = f(a) + f(b)...   [#permalink] 26 Jul 2017, 08:26
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