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If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0

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If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0  [#permalink]

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New post 21 Sep 2018, 01:41
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Difficulty:

  35% (medium)

Question Stats:

66% (01:05) correct 34% (01:20) wrong based on 147 sessions

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Re: If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0  [#permalink]

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New post 21 Sep 2018, 01:53
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Bunuel wrote:
If |x + 3| = 3, what is the value of x?

(1) x^2 ≠ 0
(2) x^2 + 6x = 0


|x + 3| = 3 i.e. x = 0 or -6

Question: what is the value of x?

Statement 1: x^2 ≠ 0
i.e. x ≠ 0
i.e. x = -6

SUFFICIENT

Statement 2: x^2 + 6x = 0
i.e. x (x+6) = 0
i.e. x = -6 or 0

NOT SUFFICIENT

Answer: Option A
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Re: If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0  [#permalink]

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New post 21 Sep 2018, 06:03
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Bunuel wrote:
If |x + 3| = 3, what is the value of x?

(1) x² ≠ 0
(2) x² + 6x = 0


Target question: What is the value of x?

Given: |x + 3| = 3
This means that EITHER x + 3 = 3 OR x + 3 = -3
If x + 3 = 3, then x = 0
If x + 3 = -3, then x = -6
So, EITHER x = 0 OR x = -6


Statement 1: x² ≠ 0
This tells us that x does not equal 0
Since we also know that EITHER x = 0 OR x = -6, we can be certain that x = -6
Since we can answer the target question with certainty, statement 1 is SUFFICIENT

Statement 2: x² + 6x = 0
Factor to get (x)(x + 6) = 0
This tells us that EITHER x = 0 OR x = -6
This doesn't help us at all, since we ALREADY knew that EITHER x = 0 OR x = -6
Since we cannot answer the target question with certainty, statement 2 is NOT SUFFICIENT

Answer: A

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Re: If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0  [#permalink]

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New post 17 Feb 2019, 00:35
Bunuel wrote:
If |x + 3| = 3, what is the value of x?

(1) x^2 ≠ 0
(2) x^2 + 6x = 0



So even we solve for the if statement we get 2 solutions i.e. 0 or -6

from 1) x^2 ≠ 0, means only -6 can work here
Sufficient

from 2) we get 2 values
x = 0 or x = -6

Out of which one value will give us a Yes, and other one will give us a No

Insufficient
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Re: If |x + 3| = 3, what is the value of x? (1) x^2 ≠ 0 (2) x^2 + 6x = 0   [#permalink] 17 Feb 2019, 00:35
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