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What is the value of │x + 7│?

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What is the value of │x + 7│? [#permalink] New post 12 Aug 2007, 11:53
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Q: What is the value of │x + 7│?

(1) │x + 3│= 14
(2) (x + 2)2 = 169
SVP
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 [#permalink] New post 12 Aug 2007, 13:46
(C) for me :)

│x + 7│ = ?

from 1
│x + 3│= 14
<=> x+3 = 14 or -(x+3) = 14
<=> x = 11 or x = -17

Then, we should check both values in |x+7|
o |11+7| = 18
o |-17+7| = 10

INSUFF.

from 2
(x + 2)^2 = 169 = 13^2 = (-13)^2
<=> x+2 = 13 or x+2 = -13
<=> x = 11 or x = -15

Then, we should check both values in |x+7|
o |11+7| = 18
o |-15+7| = 8

INSUFF.

Both (1) & (2)
We have to be with x = 11.

SUFF.

Last edited by Fig on 12 Aug 2007, 13:49, edited 1 time in total.
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Re: Mod-DS [#permalink] New post 12 Aug 2007, 13:46
smily_buddy wrote:
Q: What is the value of │x + 7│?

(1) │x + 3│= 14
(2) (x + 2)2 = 169


i get C for the answer.

(1) │x + 3│= 14
x + 3 = 14 -> x = 11
x + 3 = -14 -> x = -17
not sufficient

(2) (x + 2)2 = 169

x = 11, -15
not sufficient

putting (1) and (2) together, we know that x should be 11
so we can solve for │x + 7│
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 [#permalink] New post 12 Aug 2007, 13:52
Fig wrote:
(C) for me :)

│x + 7│ = ?

from 1
│x + 3│= 14
<=> x+3 = 14 or -(x+3) = 14
<=> x = 11 or x = -17

Then, we should check both values in |x+7|
o |11+7| = 18
o |-17+7| = 10

INSUFF.

from 2
(x + 2)^2 = 169 = 13^2 = (-13)^2
<=> x+2 = 13 or x+2 = -13
<=> x = 11 or x = -15

Then, we should check both values in |x+7|
o |11+7| = 18
o |-15+7| = 8

INSUFF.

Both (1) & (2)
We have to be with x = 11.

SUFF.


whoa we both posted around the same time! i can kinda rusty at checking at the values but the only time values may be undefined is when we have zero for the denominator? just to make sure, so in this case, would -7 work? or do we just worry about it if we had zero for denominator as i had mentioned? thanks!
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 [#permalink] New post 12 Aug 2007, 14:47
beckee529 wrote:
Fig wrote:
(C) for me :)

│x + 7│ = ?

from 1
│x + 3│= 14
<=> x+3 = 14 or -(x+3) = 14
<=> x = 11 or x = -17

Then, we should check both values in |x+7|
o |11+7| = 18
o |-17+7| = 10

INSUFF.

from 2
(x + 2)^2 = 169 = 13^2 = (-13)^2
<=> x+2 = 13 or x+2 = -13
<=> x = 11 or x = -15

Then, we should check both values in |x+7|
o |11+7| = 18
o |-15+7| = 8

INSUFF.

Both (1) & (2)
We have to be with x = 11.

SUFF.


whoa we both posted around the same time! i can kinda rusty at checking at the values but the only time values may be undefined is when we have zero for the denominator? just to make sure, so in this case, would -7 work? or do we just worry about it if we had zero for denominator as i had mentioned? thanks!


Actually, we should check the values because we could obtain with 2 different values of x a similar value of |x+7| :)

For instance, we could be with x=8 and x=-22. We would be with |x+7| = 15 and so be able to determine a unique value, answering to the question :)
  [#permalink] 12 Aug 2007, 14:47
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2 Experts publish their posts in the topic What is the value of x + 7 ? ajitsah 14 13 May 2010, 09:36
What is the value of │x + 7│? gluon 3 17 Sep 2007, 10:30
What is the value of │x + 7│? apollo168 3 23 Aug 2006, 04:56
What is the value of │x + 7│? Achilless 2 18 Aug 2006, 21:58
What is the value of │x + 7│? M8 7 05 May 2006, 19:46
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