It is currently 20 Nov 2017, 01:26

Close

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

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel

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
Intern
avatar
Joined: 26 Aug 2009
Posts: 22

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

M25: #22 [#permalink]

Show Tags

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

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

Manager
Manager
User avatar
Joined: 02 Jan 2009
Posts: 93

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

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

Show Tags

New post 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
Manager
User avatar
Joined: 29 Oct 2009
Posts: 209

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

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

Show Tags

New post 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
Manager
User avatar
Joined: 29 Oct 2009
Posts: 209

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

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

Show Tags

New post 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



GMAT Club MBA Forum Home| About| Terms and Conditions| GMAT Club Rules| Contact| Sitemap

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®.