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.
Both x and y are integers. Which of the following expression
[#permalink]
30 Jul 2020, 13:37
30 Jul 2020, 13:37
Expert Reply
2
Bookmarks
00:00
Question Stats:
61% (01:31) correct
38% (01:25) wrong based on 76 sessions
Hide Show timer Statistics
Both x and y are integers. Which of the following expressions must be the square of an integer?
Indicate all such expressions.
A. \((x+y)(x-y)+8xy+17y^2\)
B. \(9x^4-12x^2y^2+4y^4\)
C. \(x^6+2x^3y^3+y^6\)
Indicate all such expressions.
A. \((x+y)(x-y)+8xy+17y^2\)
B. \(9x^4-12x^2y^2+4y^4\)
C. \(x^6+2x^3y^3+y^6\)
Re: Both x and y are integers. Which of the following expression
[#permalink]
31 Jul 2020, 10:00
31 Jul 2020, 10:00
2
How come A is correct. If we take x=1 and y=1, expression A will be 8 which is not square of any integer.
B is correct because we can factorize it as (3x^2 - 2y^2)^2
C is correct because we can factorize it as (x^3 + y^3)^2
So, the answers should be B and C.
B is correct because we can factorize it as (3x^2 - 2y^2)^2
C is correct because we can factorize it as (x^3 + y^3)^2
So, the answers should be B and C.
Re: Both x and y are integers. Which of the following expression
[#permalink]
03 Aug 2020, 10:40
03 Aug 2020, 10:40
Expert Reply
Fixed the typo in the first answer choice.
Thanks for your patient.
Regards
Thanks for your patient.
Regards
