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Absolue Value

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Source: — Data Sufficiency |
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Re: Absolue Value

by deepoe » Sun May 03, 2009 7:54 am
moonlite wrote:If |x+2| = 4 what is the value of x?

1) x^2 is not equal to 4
2) x^2 = 36

Please explains. Thanks.
OA D

|x| is absolute value, it wil always be positive.

1) This one I can't explain.......

2) x = 6 or x = -6

Because the answer is 4. |-6+2| = -4 but because it is a absolute value it will be 4.
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Re: Absolue Value

by dmateer25 » Sun May 03, 2009 8:15 am
moonlite wrote:If |x+2| = 4 what is the value of x?

1) x^2 is not equal to 4
2) x^2 = 36

Please explains. Thanks.
OA D
|x+2| = 4

x +2 = 4
x = 2

OR

x + 2 = -4
x = -6

1) x^2 is not equal to 4

So this tells us x isn't 2. This means it is -6.

Suff

2) x^2 = 36

x=6 or -6

from solving we know that 6 wasn't one of the solutions so -6 is the answer.

Suff

D
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by maihuna » Sun May 03, 2009 9:54 am
If |x+2| = 4 what is the value of x?

1) x^2 is not equal to 4
2) x^2 = 36

================
x+2 = 4 => x=2
x+2 = -4=> x=-6

1. Says x=-6 sufficient
2. Says x=-6 sufficient

DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
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by cramya » Sun May 03, 2009 11:57 am
Maihuna,
I disagree with u on
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
Its either D OR

DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD
DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

We know u can solve absolutes, mate.... :lol:

Jus kidding, good luck.

Regards,
CR
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by aj5105 » Sun May 03, 2009 12:06 pm
Yup, (D) as shown by maihuna
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