SOLUTION: how do you simplify absolute value. example: |18| or the absolute value of -9

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Question 106968This question is from textbook prentice hall mathmatics pre algebra
: how do you simplify absolute value.
example: |18|
or the absolute value of -9 This question is from textbook prentice hall mathmatics pre algebra

Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!
The absolute value of a real number x is denoted |x+| and defined as the "unsigned" portion of x, where sgn+%28x%29is the sign function.
The absolute value is therefore always %3E=0. The absolute value of x for real x is plotted below.
|x|.......... = sgn+%28x%29
…………...= -x for x%3C=+0
……………...= x for x+%3E=0

in your case |x=18|
will be:
18 and -18