plug in numbers.Feruza Matyakubova wrote:sos!
sqrt (-x*|x|), and x has to be negative
let x = -3
sqrt (-(-3)*|-3|)
sqrt (3*3) = 3
3 = -X
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Source: Beat The GMAT — Problem Solving |
sqrt (-x*|x|), and x has to be negative
let x = -3
sqrt (-(-3)*|-3|)
sqrt (3*3) = 3
3 = -X
we know x=-ve
|x| is always + ve
-ve(-x)(x)
root x^2
that is +/- x
we know x<0
remember theere cannot be square root of a neagtive value
so -x is the answer
Vishu
|x| is always + ve
-ve(-x)(x)
root x^2
that is +/- x
we know x<0
remember theere cannot be square root of a neagtive value
so -x is the answer
Vishu
KILL !! DIE !! or BEAT my FEAR !!! de@D END!!
I thought i would be just X, because the stem says that x<0, so X is already negative.
- ngative X is positive.
im a bit confused here
- ngative X is positive.
im a bit confused here
u r right x is negative. When u evaluate the square root u get a positive number.I thought i would be just X, because the stem says that x<0, so X is already negative.
- ngative X is positive.
im a bit confused here
So the positive square root is nothing but -x.
Eg: positive square root 3
Like Vishu said x=-3 so if u get +3 as the answer from the square root evaluation is nothing but - (-3) = - (x) [SINCE WE TOOK X AS -3]
Hope this helps!
