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QOTD#7 (3 - z)(z + 4) = 0

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GRE Prep Club Legend
GRE Prep Club Legend
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Joined: 07 Jun 2014
Posts: 4809
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
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QOTD#7 (3 - z)(z + 4) = 0 [#permalink] New post 15 Jul 2016, 09:35
Expert's post
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Question Stats:

61% (00:37) correct 38% (00:37) wrong based on 18 sessions
(3 - z)(z + 4) = 0

Quantity A
Quantity B
z
5


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.
[Reveal] Spoiler: OA

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Re: QOTD#7 (3 - z)(z + 4) = 0 [#permalink] New post 16 Jul 2016, 07:31
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Solving (3 - z)(z + 4) = 0, we get z = 3 or -4. Both are less than 5, hence answer is B.
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Re: QOTD#7 (3 - z)(z + 4) = 0 [#permalink] New post 12 Jun 2019, 07:26
Expert's post
sandy wrote:
(3 - z)(z + 4) = 0

Quantity A
Quantity B
z
5


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.


If (3 - z)(z + 4) = 0, then EITHER (3 - z) = 0, OR (z + 4) = 0

Let's examine both possible cases:

case i: (3 - z) = 0
Solve: z = 3
We get:
QUANTITY A: 3
QUANTITY B: 5
In this case, Quantity B is greater


case ii: (z + 4) = 0
Solve: z = -4
We get:
QUANTITY A: -4
QUANTITY B: 5
In this case, Quantity B is greater

In BOTH possible cases, Quantity B is greater

Answer: B

Cheers,
Brent
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Brent Hanneson – Creator of greenlighttestprep.com
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Re: QOTD#7 (3 - z)(z + 4) = 0   [#permalink] 12 Jun 2019, 07:26
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