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^2 + 4x = 12
[#permalink]
22 Jan 2023, 01:35
22 Jan 2023, 01:35
00:00
Question Stats:
50% (01:31) correct
50% (01:48) wrong based on 18 sessions
Hide Show timer Statistics
\(–x^2 + 4x = – 12\)
\(y^2 – 6y – 8 = 4 – 2y\)
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
\(y^2 – 6y – 8 = 4 – 2y\)
Quantity A |
Quantity B |
\(x\) |
\(y\) |
A. The quantity in Column A is greater
B. The quantity in Column B is greater
C. The two quantities are equal
D. The relationship cannot be determined from the information given
Re: x^2 + 4x = 12
[#permalink]
22 Jan 2023, 01:43
22 Jan 2023, 01:43
Can someone explain why the answer to this question is not C?
Re: x^2 + 4x = 12
[#permalink]
22 Jan 2023, 03:10
22 Jan 2023, 03:10
1
Expert Reply
Rearranging everything
\(-x^2+4x=-12\)
\(x^2-4x=12
\)
\(x(x-4)=12\)
\(y^2-4y=12\)
\(y(y-4)=12\)
x can be 6 above and you have 12. y as well
so x=y
However, to obtain 12 x can be any number and y can be any number and you still get 12 in both equations
D is the answer
\(-x^2+4x=-12\)
\(x^2-4x=12
\)
\(x(x-4)=12\)
\(y^2-4y=12\)
\(y(y-4)=12\)
x can be 6 above and you have 12. y as well
so x=y
However, to obtain 12 x can be any number and y can be any number and you still get 12 in both equations
D is the answer
