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

 It is currently 15 Feb 2019, 23:21

### 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 February
PrevNext
SuMoTuWeThFrSa
272829303112
3456789
10111213141516
17181920212223
242526272812
Open Detailed Calendar
• ### Free GMAT Strategy Webinar

February 16, 2019

February 16, 2019

07:00 AM PST

09:00 AM PST

Aiming to score 760+? Attend this FREE session to learn how to Define your GMAT Strategy, Create your Study Plan and Master the Core Skills to excel on the GMAT.
• ### \$450 Tuition Credit & Official CAT Packs FREE

February 15, 2019

February 15, 2019

10:00 PM EST

11:00 PM PST

EMPOWERgmat is giving away the complete Official GMAT Exam Pack collection worth \$100 with the 3 Month Pack (\$299)

# Which of the following functions does not intersect with y = 3x^2 + 2x

Author Message
TAGS:

### Hide Tags

Intern
Joined: 29 Aug 2014
Posts: 2
Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

Updated on: 14 Sep 2014, 14:49
13
00:00

Difficulty:

55% (hard)

Question Stats:

59% (01:31) correct 41% (01:47) wrong based on 283 sessions

### HideShow timer Statistics

Which of the following functions does not intersect with y = 3x^2 + 2x + 1

A. y = 3x^2 + 3x + 1
B. y = 2x^2 + 3x + 1
C. y = 3x^2 + 2x + 3
D. y = 4x^2 + 2x - 3
E. y = x^2 + 2x + 3

This question is not from the OG, but I am stuck on this question. Can anyone help me?

Originally posted by jkim1118 on 14 Sep 2014, 10:26.
Last edited by Bunuel on 14 Sep 2014, 14:49, edited 1 time in total.
Renamed the topic, edited the question and added the OA.
Math Expert
Joined: 02 Sep 2009
Posts: 52905
Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

14 Sep 2014, 14:56
1
1
jkim1118 wrote:
Which of the following functions does not intersect with y = 3x^2 + 2x + 1

A. y = 3x^2 + 3x + 1
B. y = 2x^2 + 3x + 1
C. y = 3x^2 + 2x + 3
D. y = 4x^2 + 2x - 3
E. y = x^2 + 2x + 3

This question is not from the OG, but I am stuck on this question. Can anyone help me?

The graph of y = 3x^2 + 2x + 3 (option C) gives the same parabola as y = 3x^2 + 2x + 1, just shifted 2 units up. So, they won't intersect:
Attachment:

MSP2631fcd0ab556630ba400002aef01a3gd12cb24.gif [ 5.36 KiB | Viewed 3328 times ]

Similar question to practice: the-line-represented-by-which-of-the-following-equation-does-137828.html
_________________
Intern
Joined: 15 Sep 2013
Posts: 32
Concentration: Strategy, Entrepreneurship
GMAT 1: 680 Q47 V36
GMAT 2: 740 Q50 V40
GPA: 3.65
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

04 Oct 2014, 02:34
3
1
jkim1118 wrote:
Which of the following functions does not intersect with y = 3x^2 + 2x + 1

A. y = 3x^2 + 3x + 1
B. y = 2x^2 + 3x + 1
C. y = 3x^2 + 2x + 3
D. y = 4x^2 + 2x - 3
E. y = x^2 + 2x + 3

This question is not from the OG, but I am stuck on this question. Can anyone help me?

If you are familiar with graphs, this question gets solved within a minute as shown by Bunuel... but I am not that comfortable with graphs...
I solved it by equating the the equation given in the question stem to the equation given in the answer choices...
A. y = 3x^2 + 3x + 1 = 3x^2 + 2x + 1.. this gives x=0 thus these two sets of equations intersect at x=0 and y=1
B. y = 2x^2 + 3x + 1 = 3x^2 + 2x + 1... this gives x^2 -x = 0 which means either x=0 or x=1. Thus these two intersect at 2 points.
C. y = 3x^2 + 2x + 3 = 3x^2 + 2x + 1.. this does not give a solution... thus the answer is C
_________________

Please +1 KUDOS if my post helped you in any way

Math Revolution GMAT Instructor
Joined: 16 Aug 2015
Posts: 6949
GMAT 1: 760 Q51 V42
GPA: 3.82
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

29 Oct 2015, 00:00
Forget conventional ways of solving math questions. In PS, IVY approach is the easiest and quickest way to find the answer.

Which of the following functions does not intersect with y = 3x^2 + 2x + 1

A. y = 3x^2 + 3x + 1
B. y = 2x^2 + 3x + 1
C. y = 3x^2 + 2x + 3
D. y = 4x^2 + 2x - 3
E. y = x^2 + 2x + 3

Let’s find the actual intersecting point of given function and each choice.
A. 3x^2 + 2x + 1 = 3x^2 + 3x + 1 --> x=0
B. 3x^2 + 2x + 1 = 2x^2 + 3x + 1 --> x^2 – x =0 --> x=0 or 1
C. 3x^2 + 2x + 1 = 3x^2 + 2x + 3 --> 1=3(X) --> they don’t have any intersect.
D. 3x^2 + 2x + 1 = 4x^2 + 2x - 3 --> x^2 –4=0 --> x= 2 or -2
E. 3x^2 + 2x + 1 = x^2 + 2x + 3 --> 2x^2 –2 =0 --> x= 1 or –1.

So only choice (C) has no intersecting point. The answer is (C).
_________________

MathRevolution: Finish GMAT Quant Section with 10 minutes to spare
The one-and-only World’s First Variable Approach for DS and IVY Approach for PS with ease, speed and accuracy.
"Only \$149 for 3 month Online Course"
"Free Resources-30 day online access & Diagnostic Test"
"Unlimited Access to over 120 free video lessons - try it yourself"

Director
Joined: 23 Jan 2013
Posts: 557
Schools: Cambridge'16
Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

06 Nov 2015, 20:40
Given function is a parabola with y intercept = 1

A and B out because they have y intercept=1

coefficient a before x^2 should be the same not to intersect

Only C, because only difference from given is that y intercept=3. So, it is just higher

C
Manager
Joined: 12 Jun 2016
Posts: 215
Location: India
WE: Sales (Telecommunications)
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

01 Nov 2017, 00:12
Hello Moderators,

The Tag for this question says this is an OG question. However, the comment from the poster says that it is not an OG question. Can you please confirm if this is actually an OG question, please?

I took too much time to solve this question. If this is an OG question, I need to practice more and find better ways of approaching these type of question

_________________

My Best is yet to come!

Math Expert
Joined: 02 Sep 2009
Posts: 52905
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

01 Nov 2017, 00:23
susheelh wrote:
Hello Moderators,

The Tag for this question says this is an OG question. However, the comment from the poster says that it is not an OG question. Can you please confirm if this is actually an OG question, please?

I took too much time to solve this question. If this is an OG question, I need to practice more and find better ways of approaching these type of question

Removed the OG tag.

Parabolas and other graphs are tested on the GMAT though. OG questions:
https://gmatclub.com/forum/for-what-val ... 11639.html
https://gmatclub.com/forum/the-figure-s ... 60785.html
_________________
Intern
Joined: 12 Oct 2017
Posts: 40
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

01 Nov 2017, 01:08
let's "plug-in" each answer one by one. Only choice (C) has no intersecting point => answer C
Intern
Joined: 16 Jul 2016
Posts: 40
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

11 Dec 2017, 10:35
In order for two functions to intersect, substituting a certain x-value will produce the same y value for the two functions. With choice C, we can see the y value will ALWAYS be two more if we have the same x value. So the two functions can never intersect.
Non-Human User
Joined: 09 Sep 2013
Posts: 9833
Re: Which of the following functions does not intersect with y = 3x^2 + 2x  [#permalink]

### Show Tags

20 Jan 2019, 02:24
Hello from the GMAT Club BumpBot!

Thanks to another GMAT Club member, I have just discovered this valuable topic, yet it had no discussion for over a year. I am now bumping it up - doing my job. I think you may find it valuable (esp those replies with Kudos).

Want to see all other topics I dig out? Follow me (click follow button on profile). You will receive a summary of all topics I bump in your profile area as well as via email.
_________________
Re: Which of the following functions does not intersect with y = 3x^2 + 2x   [#permalink] 20 Jan 2019, 02:24
Display posts from previous: Sort by