Last visit was: 27 Dec 2024, 10:55 It is currently 27 Dec 2024, 10:55
Decision Tracker
My Rewards
New comers' posts
New posts
Unanswered

Close

GRE Prep 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 GRE 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.

Go to My Error Log Learn more
Close

Request Expert Reply

Confirm Cancel
PREVIOUS TOPIC
NEXT TOPIC

One of the roots of the equation

Tags :
Find Similar Topics  About  Add a Tag

Show Tags
Hide Tags

User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30515
Own Kudos [?]: 36889 [1]
Given Kudos: 26113
Send PM
One of the roots of the equation [#permalink] New post   03 Sep 2020, 10:46
Expert Reply
1
Bookmarks
00:00

Question Stats:

76% (00:41) correct 23% (01:09) wrong based on 67 sessions

Hide Show timer Statistics

One of the roots of the equation \(x^2+5x-c=0\) is -2, and c is a constant

Quantity A
Quantity B
c
6



A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
ShowHide Answer
Official Answer
B
User avatar
D
Carcass
Verbal Expert
Joined: 18 Apr 2015
Posts: 30515
Own Kudos [?]: 36889 [0]
Given Kudos: 26113
Send PM
Re: One of the roots of the equation [#permalink] New post   03 Sep 2020, 10:47
Expert Reply
Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!

For more theory and practice see our GRE - Math Book
avatar
JimmyPage
Intern
Intern
Joined: 04 Sep 2020
Posts: 2
Own Kudos [?]: 2 [0]
Given Kudos: 0
Send PM
Re: One of the roots of the equation [#permalink] New post   04 Sep 2020, 05:20
1
If -2 is a root, then we can plug in -2 into the equation for x, and solve for c.

(-2)^2 + 5(-2) -c = 0
c = 4-10
c = -6

So the answer is B.
avatar
Olasunbo
Manager
Manager
Joined: 08 Aug 2020
Posts: 92
Own Kudos [?]: 108 [0]
Given Kudos: 0
Send PM
Re: One of the roots of the equation [#permalink] New post   04 Sep 2020, 10:47
1
Since x=-2 us a root then we can plug -2 in the equation
-2^2+5(-2)-c=0
Then c =-6
Re writing the equation we have 2x^2+5x+6

Factorising it we have x=-2,-3
Then QTY B is greater

Posted from my mobile device Image
User avatar
B
Pranaygre
Retired Moderator
Joined: 09 Jun 2020
Posts: 205
Own Kudos [?]: 235 [0]
Given Kudos: 34
GPA: 3.21
Send PM
Re: One of the roots of the equation [#permalink] New post   13 Sep 2020, 20:41
from the equation
sum of roots will be =-5
product of roots=-c

given one root -2 the other root will be = -5-(-2)=-3
product of roots will be =6=-c

so c will be -6(quant A) < 6(quant B)

answer B will be correct
Prep Club for GRE Bot
gmatclubot
Re: One of the roots of the equation [#permalink]
13 Sep 2020, 20:41
Moderators:
adewale223
GRE Instructor
88 posts
bronaugust
GRE Forum Moderator
37 posts
BrushMyQuant
Moderator
1116 posts
VibhuAnurag
GRE Instructor
234 posts

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

Main navigation

Partners

GRE Resources

www.ets.org/gre | About | Terms and Conditions and Privacy Policy | Prep Club for GRE Rules | Contact