It is currently 17 Feb 2018, 23:13

### 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: 43789
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, 03:47
00:00

Difficulty:

25% (medium)

Question Stats:

78% (01:36) correct 22% (00:46) wrong based on 88 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)
[Reveal] Spoiler: OA

_________________
BSchool Forum Moderator
Joined: 26 Feb 2016
Posts: 2033
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, 04:31
1
KUDOS
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)
_________________

Stay hungry, Stay foolish

The function f(x) is defined for all values x as f(x)=x^4/9. What is t   [#permalink] 24 Apr 2017, 04:31
Display posts from previous: Sort by