GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 22 Jun 2018, 19:21

### 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

# The function f(x) is defined for all values x as f(x)=x^4/9. What is t

Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 46284
The function f(x) is defined for all values x as f(x)=x^4/9. What is t [#permalink]

### Show Tags

24 Apr 2017, 04:47
00:00

Difficulty:

15% (low)

Question Stats:

79% (01:27) correct 21% (00:47) wrong based on 100 sessions

### HideShow timer Statistics

The function f(x) is defined for all values x as $$f(x)=\frac{x^4}{9}$$. What is the value of f(3x) in terms of f(x)?

A. f(x)/9
B. f(x)/3
C. 9f(x)
D. 27f(x)
E. 81f(x)

_________________
BSchool Forum Moderator
Joined: 26 Feb 2016
Posts: 2834
Location: India
GPA: 3.12
The function f(x) is defined for all values x as f(x)=x^4/9. What is t [#permalink]

### Show Tags

24 Apr 2017, 05:31
1
We already know that $$f(x) = \frac{x^4}{9}$$.
Hence, $$f(3x) = \frac{(3x)^4}{9} = 9x^4$$

Now since we need f(3x) in terms of f(x),
we can compute f(3x) = 81f(x) because $$81f(x) = \frac{81*x^4}{9} = 9x^4$$ which is equal of f(3x) (Option E)
_________________

You've got what it takes, but it will take everything you've got

The function f(x) is defined for all values x as f(x)=x^4/9. What is t   [#permalink] 24 Apr 2017, 05:31
Display posts from previous: Sort by