It is currently 17 Nov 2018, 05:02

### 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

# If a#b = a2 – a, where b ≥ 0, what is the value of (–4)#4? (

 Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

If a#b = a2 – a, where b ≥ 0, what is the value of (–4)#4? ( [#permalink]  27 Jul 2018, 07:00
Expert's post
00:00

Question Stats:

100% (00:26) correct 0% (00:00) wrong based on 3 sessions
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
[Reveal] Spoiler: OA

_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

GMAT Club Legend
Joined: 07 Jun 2014
Posts: 4710
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 91

Kudos [?]: 1612 [0], given: 375

Re: If a#b = a2 – a, where b ≥ 0, what is the value of (–4)#4? ( [#permalink]  12 Aug 2018, 04:54
Expert's post
Explanation

This problem defines a function for the made-up symbol #.

In this problem a = (–4) and b = 4.

Plug the values into the function: $$(-4)^2 \sqrt{4}- (-4) = 16 \times 2 + 4 = 36$$.

Do not forget to keep the parentheses around the –4!

Also note that only the positive root of 4 applies, because the problem has been presented in the form of a real number underneath the square root sign.
_________________

Sandy
If you found this post useful, please let me know by pressing the Kudos Button

Try our free Online GRE Test

Re: If a#b = a2 – a, where b ≥ 0, what is the value of (–4)#4? (   [#permalink] 12 Aug 2018, 04:54
Display posts from previous: Sort by

# If a#b = a2 – a, where b ≥ 0, what is the value of (–4)#4? (

 Question banks Downloads My Bookmarks Reviews Important topics

 Powered by phpBB © phpBB Group Kindly note that the GRE® test is a registered trademark of the Educational Testing Service®, and this site has neither been reviewed nor endorsed by ETS®.