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GMAC practice test - tough one

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Striver: Junior | Next Rank: 30 Posts; Posts: 24; Joined: Tue May 29, 2012 3:30 pm

by Striver » Fri Jun 08, 2012 6:32 am

From GMAC practice test:

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

The answer to this was f(x) = -3x. I don't understand why?

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Source: Beat The GMAT — Problem Solving | Fri Jun 08, 2012 6:32 am

GMATGuruNY: GMAT Instructor; Posts: 15539; Joined: Tue May 25, 2010 12:04 pmFollowed by: 1906 members; Location: New York, NY; Thanked: 13060 times; GMAT Score:790

by GMATGuruNY » Fri Jun 08, 2012 7:36 am

I posted an explanation here:

https://www.beatthegmat.com/gmat-prep-fu ... 67229.html

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Anurag@Gurome: GMAT Instructor; Posts: 3835; Joined: Fri Apr 02, 2010 10:00 pmFollowed by: 523 members; Location: Milpitas, CA; Thanked: 1854 times; GMAT Score:770

by Anurag@Gurome » Fri Jun 08, 2012 9:52 am

Refer to the post here >> https://www.beatthegmat.com/functions-t1 ... tml#477877

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