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# x2 - 2x = 0

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Retired Moderator
Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926 [0], given: 394

x2 - 2x = 0 [#permalink]  20 May 2018, 13:58
Expert's post
00:00

Question Stats:

91% (00:13) correct 8% (00:18) wrong based on 12 sessions
$$x^2 - 2x = 0$$

 Quantity A Quantity B x 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.
[Reveal] Spoiler: OA

_________________

Sandy
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Intern
Joined: 08 Apr 2018
Posts: 44
Followers: 0

Kudos [?]: 16 [0], given: 15

Re: x2 - 2x = 0 [#permalink]  27 May 2018, 19:43
sandy wrote:
$$x^2 - 2x = 0$$

 Quantity A Quantity B x 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.

Hello Sandy, but if we assume x = -2, the answer for A will be 4. Why is D the answer?
Retired Moderator
Joined: 07 Jun 2014
Posts: 4803
GRE 1: Q167 V156
WE: Business Development (Energy and Utilities)
Followers: 171

Kudos [?]: 2926 [0], given: 394

Re: x2 - 2x = 0 [#permalink]  27 May 2018, 22:54
Expert's post
Emike56 wrote:
sandy wrote:
$$x^2 - 2x = 0$$

 Quantity A Quantity B x 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.

Hello Sandy, but if we assume x = -2, the answer for A will be 4. Why is D the answer?

If you assume x=-2 then Quanity A is -2.

Also$$x^2 - 2x = 0$$ is not satified by -2. So make no sense to assume x=-2.
_________________

Sandy
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Re: x2 - 2x = 0   [#permalink] 27 May 2018, 22:54
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