It is currently 23 Jul 2019, 20:55

### 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

# Which of the following equations is not equivalent to 36y^2

Author Message
TAGS:
Senior Manager
Joined: 20 May 2014
Posts: 282
Followers: 18

Kudos [?]: 50 [0], given: 220

Which of the following equations is not equivalent to 36y^2 [#permalink]  17 Oct 2017, 22:30
00:00

Question Stats:

100% (00:16) correct 0% (00:00) wrong based on 2 sessions
Which of the following equations is not equivalent to $$36y^2 + 9 = x^2$$?

(A) $$36y^2 = x^2 - 9$$

(B) $$36y^2 = (x - 3)(x + 3)$$

(C) $$108y^2 + 27 = 3x^2$$

(D) $$y^2 = \frac{x^2 - 9}{36}$$

(E) $$6y = x - 3$$

Kudos for correct solution.
[Reveal] Spoiler: OA
Director
Joined: 03 Sep 2017
Posts: 520
Followers: 1

Kudos [?]: 364 [0], given: 66

Re: Which of the following equations is not equivalent to 36y^2 [#permalink]  18 Oct 2017, 05:38
Let's analyze choice by choice

(A) $$36y^2 = x^2 - 9$$ --> this is the same after adding -9 to both sides

(B) $$36y^2 = (x - 3)(x + 3)$$ --> this is the same after rewriting x^2-9 = (x-3)(x+3)

(C) $$108y^2 + 27 = 3x^2$$ --> this is the same after multiplying both sides by 3

(D) $$y^2 = \frac{x^2 - 9}{36}$$ -> this is the same after adding -9 to both sides and dividing both sides by 36

(E) $$6y = x - 3$$

Thus, we are left with E, which is our answer!
Re: Which of the following equations is not equivalent to 36y^2   [#permalink] 18 Oct 2017, 05:38
Display posts from previous: Sort by