Find all School-related info fast with the new School-Specific MBA Forum

 It is currently 24 Oct 2016, 13:19

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# Events & Promotions

###### Events & Promotions in June
Open Detailed Calendar

# Function: can anyone help with this question

Author Message
TAGS:

### Hide Tags

Intern
Joined: 19 Dec 2009
Posts: 8
Followers: 1

Kudos [?]: 10 [0], given: 2

Function: can anyone help with this question [#permalink]

### Show Tags

01 Jan 2010, 07:31
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 100% (00:04) wrong based on 2 sessions

### HideShow timer Statistics

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) = x^1/2
d) f(x) = 2/x
e) f(x) = -3x
Verbal Forum Moderator
Joined: 02 Aug 2009
Posts: 4098
Followers: 287

Kudos [?]: 2986 [0], given: 100

Re: can anyone help with this question [#permalink]

### Show Tags

01 Jan 2010, 08:50
hi..
there is a property of multiplication called associative or commutative....
5a+5b=5(a+b)..... this is the form we require.....
means if u multiply with a constant the eq would be ok.. it will not be true for any other form -,+,/ etc
in choices only e follows it -3x.. E is the ans
_________________

Absolute modulus :http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html

Senior Manager
Joined: 22 Dec 2009
Posts: 362
Followers: 11

Kudos [?]: 358 [0], given: 47

Re: can anyone help with this question [#permalink]

### Show Tags

01 Jan 2010, 17:07
OA is E....

Always multiplication is distributed!!!

Therefore -3(a+b) = -3a + (-3b)

Cheers!
JT
_________________

Cheers!
JT...........
If u like my post..... payback in Kudos!!

|For CR refer Powerscore CR Bible|For SC refer Manhattan SC Guide|

~~Better Burn Out... Than Fade Away~~

Re: can anyone help with this question   [#permalink] 01 Jan 2010, 17:07
Similar topics Replies Last post
Similar
Topics:
2 Functions question 2 16 Oct 2011, 01:26
1 doubtful question. can anyone explain the answer choice..? 2 27 Aug 2011, 15:01
simple ps problems...can anyone help 1 10 Feb 2011, 06:04
1 Anyone Can Help Me Understand This Problem? 2 05 Dec 2010, 19:08
ps can anyone help? 4 14 Apr 2010, 17:18
Display posts from previous: Sort by