GMAT Question of the Day: Daily via email | Daily via Instagram New to GMAT Club? Watch this Video

It is currently 31 May 2020, 03:31

Close

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
Your Progress

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.

Close

Request Expert Reply

Confirm Cancel

What is the value of d? (1) n^2 + an +b = (n + c)(n + d) (2) a - c=10

  new topic post reply Question banks Downloads My Bookmarks Reviews Important topics  
Author Message
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 64249
What is the value of d? (1) n^2 + an +b = (n + c)(n + d) (2) a - c=10  [#permalink]

Show Tags

New post 17 Jan 2020, 01:35
00:00
A
B
C
D
E

Difficulty:

(N/A)

Question Stats:

80% (01:57) correct 20% (01:13) wrong based on 5 sessions

HideShow timer Statistics

GMAT Tutor
avatar
P
Joined: 24 Jun 2008
Posts: 2089
Re: What is the value of d? (1) n^2 + an +b = (n + c)(n + d) (2) a - c=10  [#permalink]

Show Tags

New post 17 Jan 2020, 06:11
Bunuel wrote:
What is the value of d?

(1) \(n^2+an+b=(n+c)(n+d)\)
(2) \(a-c=10\)


If n = 0, then using both statements, all we know is that b = cd and a = 10 + c, and d can be anything. So the answer is E.

I feel like that's not the intention behind the question; if instead we knew Statement 1 was true for every value of n, then by expanding the right side, we'd learn that c + d = a (since the coefficients in front of the 'n' terms would need to be equal on both sides), and since c + 10 = a from Statement 2, we'd know using both Statements that d = 10. But as the question is written, the answer is E.
_________________
GMAT Tutor in Montreal

If you are looking for online GMAT math tutoring, or if you are interested in buying my advanced Quant books and problem sets, please contact me at ianstewartgmat at gmail.com
GMAT Club Bot
Re: What is the value of d? (1) n^2 + an +b = (n + c)(n + d) (2) a - c=10   [#permalink] 17 Jan 2020, 06:11

What is the value of d? (1) n^2 + an +b = (n + c)(n + d) (2) a - c=10

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





Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne