sacmanitin wrote:

hi friends ,

the problem is as follow:-

what is the value of |x|

(1) x=-|x|

(2)x^2=4

please explain in details ,please provide some information on absolute value concept . i face difficulty with such

absolute value problems,thanks in advace.

Hi sacmanitin

This is a tricky question.

First, paraphrase what is being asked:

"What is the value of |X|?" means "What is the absolute value of |x|?"

I mean, what is the distance of X from zero? (This means you can disregard the signal, whatever it is)

Let's go through the information:

(1) x = -|x|

This information alone says nothing about the distance, right?

INSUFFICIENT

(2) Xˆ2 = 4

Take the square root:

sqrt (xˆ2) = sqrt(4)

x = +- 2

You still do not know whether it is either 2 or -2

It does not matter, because both have the distance of 2 from the origin.

SUFFICIENT

Got it?

If not, PM me