Check GMAT Club Decision Tracker for the Latest School Decision Releases https://gmatclub.com/AppTrack

 It is currently 29 May 2017, 07:58

### 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

# Equation

Author Message
Manager
Joined: 20 Aug 2009
Posts: 105
Followers: 2

Kudos [?]: 128 [0], given: 31

### Show Tags

06 Sep 2009, 02:02
00:00

Difficulty:

(N/A)

Question Stats:

0% (00:00) correct 0% (00:00) wrong based on 1 sessions

### HideShow timer Statistics

This topic is locked. If you want to discuss this question please re-post it in the respective forum.

For which $$p$$ the equation has no solution?

Equation 1: $$x^2+7px-16=0$$

Equation 2: $$x^2-5px+13=0$$

Equation 3: $$x^2-4px-17=0$$

Equation 4: $$3x^2-5px+13=0$$

I've made the prob myself. Have no OA.
Manager
Joined: 19 Jul 2009
Posts: 53
Schools: McIntire, Fuqua, Villanova, Vandy, WashingtonU
Followers: 0

Kudos [?]: 10 [0], given: 4

### Show Tags

06 Sep 2009, 17:07
a * x^2 + b * x + c = 0 does not have a solution in only one case: if b^2 - 4ac < 0.

Plugin your numbers and p's and solve that inequality. Example:
x^2 - 7px - 16 = 0
b^2 - 4ac = 49p^2 - 4 * 16
49p^2 - 4 * 16 < 0 well, your numbers are all screwed up, so the answers wont be pretty
_________________

12/23 GMATPrep #1: 730 q50 v38
12/26 MGMAT CAT #1: 730 q50 v40
01/01 MGMAT CAT #2: 710 q51 v36
01/12 Real GMAT #1: 690... WTF?!?!?!?!?!?!
...
02/28 Real GMAT #2: ...

Re: Equation   [#permalink] 06 Sep 2009, 17:07
Display posts from previous: Sort by