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

 It is currently 03 May 2015, 04:41

### 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

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

Author Message
TAGS:
Senior Manager
Joined: 02 Sep 2006
Posts: 256
Followers: 1

Kudos [?]: 20 [0], given: 0

For which of the following functions is f(a+b)=f(a)+f(b) for [#permalink]  04 Apr 2007, 20:32
00:00

Difficulty:

(N/A)

Question Stats:

100% (01:02) correct 0% (00:00) wrong based on 0 sessions
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)=square 4

d)f(x)=2/x

e)f(x)=-3x
Intern
Joined: 04 May 2004
Posts: 48
Location: India
Followers: 0

Kudos [?]: 20 [0], given: 0

Simple value substitution ...

a)f(x)=x^2

x =5, fx =25
a=1, b=4, fab=17 NO

b)f(x)=x+1
x=5, fx=6
a=4,b=1,fab=7

c)f(x)=square 4
What is square 4????

d)f(x)=2/x
x=8, fx=1/4
a=4, b=4, fab= 1

e)f(x)=-3x
x=5, fx=-15
a=4, b=1, fab=-12-3=-15

satisfies ... another data set to make sure
x=8, fx=-24
a=6,b=2, fab=-18-6=-24

Director
Joined: 14 Jan 2007
Posts: 780
Followers: 2

Kudos [?]: 71 [0], given: 0

see the following post....best explanation..
http://www.gmatclub.com/phpbb/viewtopic.php?t=34465
Similar topics Replies Last post
Similar
Topics:
24 For which of the following functions is f(a+b)=f(a)+f(b) for 14 23 Apr 2010, 15:24
For which of the following functions is f(a+b)=f(a)+f(b) for 1 28 Oct 2007, 17:56
For which of the following functions is f(a+b)=f(a)+f(b) for 1 29 Jul 2007, 11:01
For which of the following functions is f(a+b)=f(a)+f(b) for 1 03 Apr 2006, 03:07
For which of the following functions is f(a+b)=f(a)+f(b) for 3 21 Dec 2005, 05:56
Display posts from previous: Sort by