GRE Prep 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
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
(x-3y)(x+3y)=7
[#permalink]
18 Aug 2020, 09:26
18 Aug 2020, 09:26
Expert Reply
00:00
Question Stats:
100% (00:17) correct
0% (00:00) wrong based on 27 sessions
Hide Show timer Statistics
\((x-3y)(x+3y)=7\)
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Quantity A |
Quantity B |
\(x^2-9y^2\) |
\(7\) |
A) Quantity A is greater.
B) Quantity B is greater.
C) The two quantities are equal.
D) The relationship cannot be determined from the information given.
Re: (x-3y)(x+3y)=7
[#permalink]
18 Aug 2020, 09:26
18 Aug 2020, 09:26
Expert Reply
Post A Detailed Correct Solution For The Above Questions And Get A Kudos.
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
Question From Our New Project: GRE Quant Challenge Questions Daily - NEW EDITION!
Re: (x-3y)(x+3y)=7
[#permalink]
18 Aug 2020, 11:45
18 Aug 2020, 11:45
The left hand side is of the form (a+b)(a-b)
So we know it's equal to a^2 - b^2.
Applying this with a=x and b=3y, this gives (x)^2 - (3y)^2=x^2 - 9y^2
So we have quantity A = quantity B.
So we know it's equal to a^2 - b^2.
Applying this with a=x and b=3y, this gives (x)^2 - (3y)^2=x^2 - 9y^2
So we have quantity A = quantity B.
