Last visit was: 17 Jul 2025, 14:37 It is currently 17 Jul 2025, 14:37
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
User avatar
inakihernandez
Joined: 30 Aug 2015
Last visit: 25 Aug 2017
Posts: 21
Own Kudos:
1,425
 [6]
Given Kudos: 8
GMAT 1: 570 Q42 V27
GMAT 2: 680 Q50 V35
GMAT 2: 680 Q50 V35
Posts: 21
Kudos: 1,425
 [6]
1
Kudos
Add Kudos
5
Bookmarks
Bookmark this Post
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 17 July 2025
Posts: 102,605
Own Kudos:
742,278
 [2]
Given Kudos: 98,220
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,605
Kudos: 742,278
 [2]
1
Kudos
Add Kudos
1
Bookmarks
Bookmark this Post
User avatar
Lucy Phuong
Joined: 24 Jan 2017
Last visit: 12 Aug 2021
Posts: 119
Own Kudos:
345
 [2]
Given Kudos: 106
GMAT 1: 640 Q50 V25
GMAT 2: 710 Q50 V35
GPA: 3.48
Products:
GMAT 2: 710 Q50 V35
Posts: 119
Kudos: 345
 [2]
2
Kudos
Add Kudos
Bookmarks
Bookmark this Post
User avatar
Bunuel
User avatar
Math Expert
Joined: 02 Sep 2009
Last visit: 17 July 2025
Posts: 102,605
Own Kudos:
Given Kudos: 98,220
Products:
Expert
Expert reply
Active GMAT Club Expert! Tag them with @ followed by their username for a faster response.
Posts: 102,605
Kudos: 742,278
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Lucy Phuong
Hi,

Any admin/mod could please fix the typos in this question? Bunuel

There are actually 2 correct answers (A) and (C)

Which of the following equations is NOT equivalent to 4a^2 = 16b^2 + 49?

(A) 16b^2+49/4= a^2

(C) 2a-4b=7

Based on the posted OA as (C), adjustment should be made on (A) as follows: (A) 4b^2+49/4= a^2, so that (A) would become equivalent to 4a^2 = 16b^2 + 49

Please fix it so that users will not be confused.. Thanks.
_______________
Edited. Thank you.
User avatar
RaguramanS
Joined: 17 Feb 2016
Last visit: 09 Feb 2018
Posts: 71
Own Kudos:
Given Kudos: 59
Location: India
Concentration: General Management, Entrepreneurship
GMAT 1: 660 Q47 V36
GPA: 3.12
WE:Education (Internet and New Media)
Products:
GMAT 1: 660 Q47 V36
Posts: 71
Kudos: 158
Kudos
Add Kudos
Bookmarks
Bookmark this Post
Which of the following equations is NOT equivalent to \(4a^2 = 16b^2 + 49\)?


\(4a^2 = 16b^2 + 49\)=
\(4a^2-16b^2=49\)

(A) \(\frac{16b^2+49}{4}= a^2\)
Rearranging the equation gives this answer

(B) \(\frac{(2a-7)(2a+7)}{16}=b^2\)
The equation can be rewriiten in th form of (a+b) * (a-b)
\(4a^2-49=16b^2\)
\((2a+7)(2a-7)=16b^2\)

(C) \(2a-4b=7\)
This is not achievable even after solving

(D) \(8a^2 - 32b^2=98\)
This equation is multiplied by 2 from the original equation

(E) \(4(a-2b)(a+2b)=49\)[/quote]
\(4a^2-16b^2= 49\)
\(4(a^2-4b^2)=49\)
The equation can be rewriiten in th form of (a+b) * (a-b)

Option C is not possible
User avatar
bumpbot
User avatar
Non-Human User
Joined: 09 Sep 2013
Last visit: 04 Jan 2021
Posts: 37,440
Own Kudos:
Posts: 37,440
Kudos: 1,013
Kudos
Add Kudos
Bookmarks
Bookmark this Post
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.
Moderators:
Math Expert
102605 posts
PS Forum Moderator
697 posts