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

 It is currently 20 Nov 2019, 22:36 ### 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

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.  # The function f is defined by f (x) =√x − 20 for all positive numbers x

Author Message
TAGS:

### Hide Tags

Math Expert V
Joined: 02 Sep 2009
Posts: 59183
The function f is defined by f (x) =√x − 20 for all positive numbers x  [#permalink]

### Show Tags 00:00

Difficulty:   15% (low)

Question Stats: 83% (01:08) correct 17% (02:02) wrong based on 38 sessions

### HideShow timer Statistics

The function f is defined by f (x) =√x − 20 for all positive numbers x. If p = f(q) for some positive numbers q and p, what is q in terms of p?

(A) (p + 20)^2

(B) √(p + 20)

(C) (√p + 20)^2

(D) √(p^2 + 20)

(E) (p^2 + 20)^2

_________________
Math Expert V
Joined: 02 Aug 2009
Posts: 8201
Re: The function f is defined by f (x) =√x − 20 for all positive numbers x  [#permalink]

### Show Tags

Bunuel wrote:
The function f is defined by f (x) =√x − 20 for all positive numbers x. If p = f(q) for some positive numbers q and p, what is q in terms of p?

(A) (p + 20)^2

(B) √(p + 20)

(C) (√p + 20)^2

(D) √(p^2 + 20)

(E) (p^2 + 20)^2

$$f(q)=√q-20=p.............√q=p+20.......q=(p+20)^2$$...A

OR

Take p=1, so √q-20=1.....q=(20+1)^2
Look in choices
Only A matches
_________________ Re: The function f is defined by f (x) =√x − 20 for all positive numbers x   [#permalink] 01 Oct 2018, 23:13
Display posts from previous: Sort by

# The function f is defined by f (x) =√x − 20 for all positive numbers x  