 It is currently 26 Mar 2019, 00:18 ### 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

#### Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here. # Which of the following could be the equation of the graph in  Question banks Downloads My Bookmarks Reviews Important topics
Author Message
TAGS:
Moderator  Joined: 18 Apr 2015
Posts: 5917
Followers: 96

Kudos [?]: 1158 , given: 5488

Which of the following could be the equation of the graph in [#permalink]
Expert's post 00:00

Question Stats: 99% (00:19) correct 0% (00:00) wrong based on 7 sessions
Attachment: xy.jpg [ 18.33 KiB | Viewed 2677 times ]

Which of the following could be the equation of the graph in the xy-plane shown above?

A. $$y = x^2 + x - 60$$

B. $$y = x^2 + x - 20$$

C. $$y = x^2 + 3x - 60$$

D. $$y = 3x^2 + x - 60$$

E. $$y = 3x^2 + 3x - 60$$
[Reveal] Spoiler: OA

_________________ Manager Joined: 25 Nov 2017
Posts: 51
Followers: 0

Kudos [?]: 41  , given: 5

Re: Which of the following could be the equation of the graph in [#permalink]
2
KUDOS
A. y = x^2 + x - 60

B. y = x^2 + x - 20

C. y = x^2 + 3x - 60

D. y = 3x^2 + x - 60

E. y = 3x^2 + 3x - 60

The parabola is in form of a a^2 + bx +c
The x-intercepts are the solutions to the equation
x1=−b−Squroot(b^2−4ac)/2a

The y-intercept is c, as y intercept means the value of y when x=0. So c = -60?
Moderator  Joined: 18 Apr 2015
Posts: 5917
Followers: 96

Kudos [?]: 1158 , given: 5488

Re: Which of the following could be the equation of the graph in [#permalink]
Expert's post
_________________ Director Joined: 20 Apr 2016
Posts: 826
WE: Engineering (Energy and Utilities)
Followers: 11

Kudos [?]: 603  , given: 124

Re: Which of the following could be the equation of the graph in [#permalink]
2
KUDOS
Carcass wrote:
Attachment:
The attachment xy.jpg is no longer available

Which of the following could be the equation of the graph in the xy-plane shown above?

A. $$y = x^2 + x - 60$$

B. $$y = x^2 + x - 20$$

C. $$y = x^2 + 3x - 60$$

D. $$y = 3x^2 + x - 60$$

E. $$y = 3x^2 + 3x - 60$$

Here we have to use the vertex formula which is-

$$y = a(x-h)^2 + k$$

here h= vertex

From the graph k = -60 and h almost equal to -1

SO we need a equation as

y= (x-(-1)) -60

or y = (x + 1) -60

Only equation E have the same presentation

because $$y = 3x^2 +3x -60$$

or it can be written y = 3x(x + 1) - 60
Attachments xy.jpg [ 12.87 KiB | Viewed 2626 times ]

_________________

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

Rules for Posting https://greprepclub.com/forum/rules-for ... -1083.html

Moderator  Joined: 18 Apr 2015
Posts: 5917
Followers: 96

Kudos [?]: 1158 , given: 5488

Re: Which of the following could be the equation of the graph in [#permalink]
Expert's post
Great explanation and reply.

Thank you so much @pranab01

Regards
_________________ Intern Joined: 27 Oct 2018
Posts: 49
Followers: 0

Kudos [?]: 12  , given: 27

Re: Which of the following could be the equation of the graph in [#permalink]
1
KUDOS
Put the points (4,0) and (-4,0) to come to the solution in less time Director Joined: 09 Nov 2018
Posts: 509
Followers: 0

Kudos [?]: 21 , given: 1

Re: Which of the following could be the equation of the graph in [#permalink]
pranab01 wrote:
Carcass wrote:
Attachment:
xy.jpg

because $$y = 3x^2 +3x -60$$

or it can be written y = 3x(x + 1) - 60

What's wrong with option (a)

can be written y= x(x+1)-60 Re: Which of the following could be the equation of the graph in   [#permalink] 16 Nov 2018, 20:52
Display posts from previous: Sort by

# Which of the following could be the equation of the graph in  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®.