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Is x = 5?

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Math Expert
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Is x = 5?  [#permalink]

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New post 14 Aug 2017, 06:18
1
4
00:00
A
B
C
D
E

Difficulty:

  45% (medium)

Question Stats:

50% (00:49) correct 50% (01:02) wrong based on 87 sessions

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Joined: 20 Jun 2014
Posts: 51
GMAT 1: 630 Q49 V27
GMAT 2: 660 Q49 V32
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Re: Is x = 5?  [#permalink]

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New post 14 Aug 2017, 06:43
From A x = 0 or x = 5 not sufficient
From B x = 0 or x = -5
So sufficient B.
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Re: Is x = 5?  [#permalink]

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New post 14 Aug 2017, 07:37
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Re: Is x = 5?  [#permalink]

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New post 24 Aug 2017, 13:37
Bunuel wrote:
Is x = 5?

(1) \(x^2-5x=0\)

(2) \(2x^2+10x=0\)


We need to determine whether x = 5.

Statement One Alone:

x^2 - 5x = 0

x^2 - 5x = 0

x(x - 5) = 0

x = 0 or x = 5

Since x could be either 0 or 5, statement one is not sufficient to answer the question.

Statement Two Alone:

2x^2 + 10x = 0

2x^2 + 10x = 0

2x(x + 5) = 0

x = 0 or x = - 5

Since x could be either 0 or -5, x will never equal 5. Statement two is sufficient to answer the question.

Answer: B
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Re: Is x = 5?  [#permalink]

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New post 26 Aug 2017, 03:35
B. As we know it will not be 5. Statement 1 gives 0,5 (insufficient)


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Re: Is x = 5?   [#permalink] 26 Aug 2017, 03:35
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