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

It is currently 24 Jul 2014, 04:16

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.

Events & Promotions

Events & Promotions in June
Open Detailed Calendar

m25 q22

  Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Intern
Intern
avatar
Joined: 17 Mar 2010
Posts: 39
Followers: 2

Kudos [?]: 57 [0], given: 26

GMAT ToolKit User
m25 q22 [#permalink] New post 13 May 2010, 11:46
If function f(x) satisfiesf(x) = f(x^2) for all x , which of the following must be true?



* f(4) = f(2)f(2)
* f(16) - f(-2) = 0
* f(-2) + f(4) = 0
* f(3) = 3f(3)
* f(0) = 0

f(-2) = f(2) = f(4) = f(16) . The other choices are not necessarily true. Consider f(x) = 3 for all x .
The correct answer is B.
I don't really understand why you are doing f(-2) = f(2) = f(4) = f(16). Where does it say in the problem that you can use the function on a previous function ?????
_________________

If my post helped you : KUDOS KUDOS KUDOS

Current Student
avatar
Joined: 31 Mar 2010
Posts: 167
Schools: Tuck Class of 2013
Followers: 2

Kudos [?]: 17 [0], given: 4

GMAT ToolKit User
Re: m25 q22 [#permalink] New post 14 May 2010, 06:41
Very interesting question, I will wait for the specialists. :|
Manager
Manager
User avatar
Joined: 02 May 2012
Posts: 109
Location: United Kingdom
WE: Account Management (Other)
Followers: 0

Kudos [?]: 12 [0], given: 34

Re: m25 q22 [#permalink] New post 18 Sep 2012, 07:08
So the f(x)=f(x^2), so f(2)=f(2^2)=f(4), and f(4)=f(4^2)=f(16).... therefore f(2)=f(4)=f(16).... Cool?

So then f(-2)=f(-2^2)=f(4), and since f(4)=f(2) you can say f(-2)=f(2)=f(4)....... Cool?

Cool.

B.
_________________

In the study cave!

Expert Post
Math Expert
User avatar
Joined: 02 Sep 2009
Posts: 18714
Followers: 3238

Kudos [?]: 22296 [0], given: 2612

Re: m25 q22 [#permalink] New post 18 Sep 2012, 07:21
Expert's post
leilak wrote:
If function f(x) satisfiesf(x) = f(x^2) for all x , which of the following must be true?



* f(4) = f(2)f(2)
* f(16) - f(-2) = 0
* f(-2) + f(4) = 0
* f(3) = 3f(3)
* f(0) = 0

f(-2) = f(2) = f(4) = f(16) . The other choices are not necessarily true. Consider f(x) = 3 for all x .
The correct answer is B.
I don't really understand why you are doing f(-2) = f(2) = f(4) = f(16). Where does it say in the problem that you can use the function on a previous function ?????


OPEN DISCUSSION OF THIS QUESTION IS HERE: if-function-f-x-satisfies-f-x-f-x-2-for-all-x-107351.html?hilit=function%20satisfies
_________________

NEW TO MATH FORUM? PLEASE READ THIS: ALL YOU NEED FOR QUANT!!!

PLEASE READ AND FOLLOW: 11 Rules for Posting!!!

RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory; 7. Remainders; 8. Overlapping Sets; 9. PDF of Math Book; 10. Remainders; 11. GMAT Prep Software Analysis NEW!!!; 12. SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) NEW!!!; 12. Tricky questions from previous years. NEW!!!;

COLLECTION OF QUESTIONS:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS ; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


What are GMAT Club Tests?
25 extra-hard Quant Tests

Get the best GMAT Prep Resources with GMAT Club Premium Membership

Re: m25 q22   [#permalink] 18 Sep 2012, 07:21
    Similar topics Author Replies Last post
Similar
Topics:
1 m25 Q22 pls explain InspiredAnimal 3 08 May 2011, 04:38
18 m25 #12 bigfernhead 20 28 Oct 2008, 05:23
11 Experts publish their posts in the topic m25#02 duuuma 29 17 Oct 2008, 13:28
21 Experts publish their posts in the topic m25 #22 duuuma 21 20 Oct 2008, 14:27
16 Experts publish their posts in the topic M25 #29 sharmar 23 09 Oct 2008, 06:34
Display posts from previous: Sort by

m25 q22

  Question banks Downloads My Bookmarks Reviews Important topics  

Moderators: Bunuel, WoundedTiger



cron

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

Powered by phpBB © phpBB Group and phpBB SEO

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®.