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

It is currently 19 Oct 2019, 16:00

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

Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?

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

Hide Tags

Find Similar Topics 
Math Expert
User avatar
V
Joined: 02 Sep 2009
Posts: 58445
Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?  [#permalink]

Show Tags

New post 28 Mar 2018, 23:35
00:00
A
B
C
D
E

Difficulty:

  35% (medium)

Question Stats:

62% (01:04) correct 38% (01:07) wrong based on 140 sessions

HideShow timer Statistics

SC Moderator
User avatar
V
Joined: 23 Sep 2015
Posts: 1716
GMAT ToolKit User Reviews Badge
Re: Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?  [#permalink]

Show Tags

New post 28 Mar 2018, 23:49
sum = -b
depending on the value of b , sum will be decide, A is correct.
_________________
Thanks!
Do give some kudos.

Simple strategy:
“Once you’ve eliminated the impossible, whatever remains, however improbable, must be the truth.”

Want to improve your Score:
GMAT Ninja YouTube! Series 1| GMAT Ninja YouTube! Series 2 | How to Improve GMAT Quant from Q49 to a Perfect Q51 | Time management

My Notes:
Reading comprehension | Critical Reasoning | Absolute Phrases | Subjunctive Mood
Manager
Manager
User avatar
B
Joined: 01 Feb 2018
Posts: 73
Location: India
Concentration: Entrepreneurship, Marketing
GPA: 4
WE: Consulting (Consulting)
Re: Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?  [#permalink]

Show Tags

New post 07 Apr 2018, 06:16
GMAT215 wrote:
Bunuel wrote:
Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?

(1) b < 0
(2) c < 0




need an explanation.. pls :(




I was not knowing that it was that simple, found this on gooogle, hope it helps :)
Attachments

Untitled.png
Untitled.png [ 22.37 KiB | Viewed 954 times ]

CEO
CEO
User avatar
D
Status: GMATINSIGHT Tutor
Joined: 08 Jul 2010
Posts: 2978
Location: India
GMAT: INSIGHT
Schools: Darden '21
WE: Education (Education)
Reviews Badge
Re: Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?  [#permalink]

Show Tags

New post 08 Apr 2018, 01:18
Bunuel wrote:
Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?

(1) b < 0
(2) c < 0


For any quadratic equation ax^2 + bx + c = 0

the sum of the roots = -b/a


Here, comparing x^2 + bx + c = 0 with ax^2 + bx + c = 0

we find, a = 1, b = b and c = c

now Sum of the roots = -b/1 = -b

For sum of the roots to be positive, b must be Negative

Statement 1: b < 0

SUFFICIENT

Statement 2: c < 0

No information about b hence

NOT SUFFICIENT

Answer: option A
_________________
Prosper!!!
GMATinsight
Bhoopendra Singh and Dr.Sushma Jha
e-mail: info@GMATinsight.com I Call us : +91-9999687183 / 9891333772
Online One-on-One Skype based classes and Classroom Coaching in South and West Delhi
http://www.GMATinsight.com/testimonials.html

ACCESS FREE GMAT TESTS HERE:22 ONLINE FREE (FULL LENGTH) GMAT CAT (PRACTICE TESTS) LINK COLLECTION
Intern
Intern
avatar
B
Joined: 27 Sep 2017
Posts: 9
Location: India
GPA: 3.38
Re: Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?  [#permalink]

Show Tags

New post 27 Nov 2018, 09:52
1
Bunuel wrote:
Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?

(1) b < 0
(2) c < 0







ALWAYS REMEMBER

For any given quadratic equation ax^2 +bx+c


1. SUM OF ROOTS OF QUADRATIC EQUATION IS -b/a

2.PRODUCT OF ROOTS OF QUADRATIC EQUATION IS c/a
GMAT Club Bot
Re: Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?   [#permalink] 27 Nov 2018, 09:52
Display posts from previous: Sort by

Is the sum of the roots of the equation, x^2 + bx + c = 0, positive?

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





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