plug in...crak.gmat wrote:If x < 0 , what is the value of (-x.|x|) ^ 1/2.
Ans. Should it be -x or x?
let x =-2
(-x.|x|) ^ 1/2
[-(-2).|-2|)^1/2
4^1/2 = 2 which is -X
hope that helps...
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Absolute x
Source: Beat The GMAT — Problem Solving |
let x =-2
(-x.|x|) ^ 1/2
[-(-2).|-2|)^1/2
4^1/2 = 2 which is -X
hope that helps...
sudhir3127 wrote:plug in...crak.gmat wrote:If x < 0 , what is the value of (-x.|x|) ^ 1/2.
Ans. Should it be -x or x?
let x =-2
(-x.|x|) ^ 1/2
[-(-2).|-2|)^1/2
4^1/2 = 2 which is -X
hope that helps...
Yes it does help and that is the correct answer. But the place where I got confused was where you did the final evaluation of 4^1/2. The result could be either 2 or -2? How did you know to go with 2?
AFAIK .... there no negative square-roots in GMAT... so its always positive...crak.gmat wrote:sudhir3127 wrote:plug in...crak.gmat wrote:If x < 0 , what is the value of (-x.|x|) ^ 1/2.
Ans. Should it be -x or x?
let x =-2
(-x.|x|) ^ 1/2
[-(-2).|-2|)^1/2
4^1/2 = 2 which is -X
hope that helps...
Yes it does help and that is the correct answer. But the place where I got confused was where you did the final evaluation of 4^1/2. The result could be either 2 or -2? How did you know to go with 2?
hope that helps..
