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

 It is currently 18 Dec 2018, 02:59

### 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 December
PrevNext
SuMoTuWeThFrSa
2526272829301
2345678
9101112131415
16171819202122
23242526272829
303112345
Open Detailed Calendar
• ### Happy Christmas 20% Sale! Math Revolution All-In-One Products!

December 20, 2018

December 20, 2018

10:00 PM PST

11:00 PM PST

This is the most inexpensive and attractive price in the market. Get the course now!
• ### Key Strategies to Master GMAT SC

December 22, 2018

December 22, 2018

07:00 AM PST

09:00 AM PST

Attend this webinar to learn how to leverage Meaning and Logic to solve the most challenging Sentence Correction Questions.

# If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:

### Hide Tags

Math Expert
Joined: 02 Sep 2009
Posts: 51281
If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4?  [#permalink]

### Show Tags

29 Jul 2018, 23:50
1
00:00

Difficulty:

15% (low)

Question Stats:

81% (01:06) correct 19% (00:45) wrong based on 21 sessions

### HideShow timer Statistics

If $$a#b = a^2*\sqrt{b} - a$$, where b ≥ 0, what is the value of (–4)#4?

(A) –36
(B) –28
(C) 12
(D) 28
(E) 36

_________________
Math Expert
Joined: 02 Aug 2009
Posts: 7112
Re: If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4?  [#permalink]

### Show Tags

30 Jul 2018, 01:28
1
Bunuel wrote:
If $$a#b = a2\sqrt{b} - a$$, where b ≥ 0, what is the value of (–4)#4?

(A) –36
(B) –28
(C) 12
(D) 28
(E) 36

Bunuel, can you pl check, I think there is a typo because none of the answer matches in the given function..
It should be $$a#b=a^2\sqrt{b}-a$$
In -4#4, a=-4 and b=4..
Therefore $$-4#4=(-4)^2\sqrt{4}-(-4)=4*4*2+4=32+4=36$$

E

Posted from my mobile device
_________________

1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html

GMAT online Tutor

Math Expert
Joined: 02 Sep 2009
Posts: 51281
Re: If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4?  [#permalink]

### Show Tags

30 Jul 2018, 01:44
chetan2u wrote:
Bunuel wrote:
If $$a#b = a2\sqrt{b} - a$$, where b ≥ 0, what is the value of (–4)#4?

(A) –36
(B) –28
(C) 12
(D) 28
(E) 36

Bunuel, can you pl check, I think there is a typo because none of the answer matches in the given function..
It should be $$a#b=a^2\sqrt{b}-a$$
In -4#4, a=-4 and b=4..
Therefore $$-4#4=(-4)^2\sqrt{4}-(-4)=4*4*2+4=32+4=36$$

E

Posted from my mobile device

____________
You are right. Edited. Thank you.
_________________
Re: If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4? &nbs [#permalink] 30 Jul 2018, 01:44
Display posts from previous: Sort by

# If a#b = a^2 – a, where b ≥ 0, what is the value of (–4)#4?

 new topic post reply Question banks Downloads My Bookmarks Reviews Important topics

 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®.