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p^2 or -p^2
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01 Apr 2021, 01:58
01 Apr 2021, 01:58
Expert Reply
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Question Stats:
40% (00:23) correct
59% (00:24) wrong based on 22 sessions
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Quantity A |
Quantity B |
\(p^2 \) |
\(-p^2 \) |
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.
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Retired Moderator
Joined: 10 Apr 2015
Posts: 6218
Given Kudos: 136
Re: p^2 or -p^2
[#permalink]
01 Apr 2021, 05:47
01 Apr 2021, 05:47
1
Carcass wrote:
Quantity A |
Quantity B |
\(p^2 \) |
\(-p^2 \) |
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.
Kudos for the right answer and explanation
Question part of the project GRE Quantitative Reasoning Daily Challenge - (2021) EDITION
GRE - Math Book
Some students will assume that \(-p^2 = (-p)^2 \), but they are not equal.
Instead, \(-p^2 = (-1)(p^2) \)
So, Let's test some numbers.....
case i: \(p = 0\)
We get:
Quantity A: \(p^2 =0^2 = 0\)
Quantity B: \(-p^2 = (-1)(p^2) = (-1)(0^2)= (-1)(0)=0\)
In this case, the two quantities are equal
case i: \(p = 1\)
We get:
Quantity A: \(p^2 =1^2 = 1\)
Quantity B: \(-p^2 = (-1)(p^2) = (-1)(1^2)= (-1)(1)=-1\)
In this case, Quantity A is greater
Answer: D
Re: p^2 or -p^2
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01 Apr 2021, 22:59
01 Apr 2021, 22:59
Expert Reply
I think the book assumed what you just said brent
It reports A
It reports A
