It is currently 20 Nov 2017, 01:26

### 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
Your Progress

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

# M25: #22

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
Intern
Joined: 26 Aug 2009
Posts: 22

Kudos [?]: 4 [0], given: 3

M25: #22 [#permalink]

### Show Tags

31 Oct 2009, 06:15
I'm having some trouble understanding the layout of these "function" problems.

In the following question, f(x) = f(x^2) ... doesn't this mean that f(2) = f(2^2) = 4?

Therefore, in answer #1, the left side is:

f(4) which should equal (4^2) =16. The right side has (2^2)*(2^2) = 4*4 =16.

Perhaps I'm missing something here and would appreciate any clarification.

Thanks
Attachments

ScreenHunter_28 Oct. 30 18.42.gif [ 13.34 KiB | Viewed 1703 times ]

Kudos [?]: 4 [0], given: 3

Manager
Joined: 02 Jan 2009
Posts: 93

Kudos [?]: 93 [0], given: 6

Location: India
Schools: LBS
Re: M25: #22 [#permalink]

### Show Tags

31 Oct 2009, 06:58
stilite wrote:
I'm having some trouble understanding the layout of these "function" problems.

In the following question, f(x) = f(x^2) ... doesn't this mean that f(2) = f(2^2) = 4?

Therefore, in answer #1, the left side is:

f(4) which should equal (4^2) =16. The right side has (2^2)*(2^2) = 4*4 =16.

Perhaps I'm missing something here and would appreciate any clarification.

Thanks

the question talks about the relation between f(x) and f(x^2)

it doesnt say that f(x) = x^2 right?

so f(2) = f(2^2) = f(4) and not the value 4.

if f(x) = f(x^2)
then f(x^2) = f([x^2]^2) = f(x^4) ... so on and so forth.

B satisfies this.

f(-2) = f([-2]^2) = f(4) = f(4^2) = f(16)
_________________

The Legion dies, it does not surrender.

Kudos [?]: 93 [0], given: 6

Manager
Joined: 29 Oct 2009
Posts: 209

Kudos [?]: 1658 [0], given: 18

GMAT 1: 750 Q50 V42
Re: M25: #22 [#permalink]

### Show Tags

31 Oct 2009, 07:18
I have a doubt.. suppose we were to write all of them in the form of functions,

for eg:

1) f(x^2) = f(x)*f(x)

2) f(x) = f(x^4)

3) f(x) = -f(x^2)

then would choices 4 and five be :

4) f(x) = 3*f(x)

5) f(x) = 0

or

4) f(x) = x*f(x)

5 f(x) = x

?
_________________

Click below to check out some great tips and tricks to help you deal with problems on Remainders!
http://gmatclub.com/forum/compilation-of-tips-and-tricks-to-deal-with-remainders-86714.html#p651942

Word Problems Made Easy!
1) Translating the English to Math : http://gmatclub.com/forum/word-problems-made-easy-87346.html
2) 'Work' Problems Made Easy : http://gmatclub.com/forum/work-word-problems-made-easy-87357.html
3) 'Distance/Speed/Time' Word Problems Made Easy : http://gmatclub.com/forum/distance-speed-time-word-problems-made-easy-87481.html

Kudos [?]: 1658 [0], given: 18

Manager
Joined: 29 Oct 2009
Posts: 209

Kudos [?]: 1658 [0], given: 18

GMAT 1: 750 Q50 V42
Re: M25: #22 [#permalink]

### Show Tags

15 Nov 2009, 15:51
PAGING BUNUEL : Please see if you can clarify the above doubt for me... Will be much appreciated. Thanks!
_________________

Click below to check out some great tips and tricks to help you deal with problems on Remainders!
http://gmatclub.com/forum/compilation-of-tips-and-tricks-to-deal-with-remainders-86714.html#p651942

Word Problems Made Easy!
1) Translating the English to Math : http://gmatclub.com/forum/word-problems-made-easy-87346.html
2) 'Work' Problems Made Easy : http://gmatclub.com/forum/work-word-problems-made-easy-87357.html
3) 'Distance/Speed/Time' Word Problems Made Easy : http://gmatclub.com/forum/distance-speed-time-word-problems-made-easy-87481.html

Kudos [?]: 1658 [0], given: 18

Re: M25: #22   [#permalink] 15 Nov 2009, 15:51
Display posts from previous: Sort by

# M25: #22

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

Moderator: Bunuel

 Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne Kindly note that the GMAT® test is a registered trademark of the Graduate Management Admission Council®, and this site has neither been reviewed nor endorsed by GMAC®.