Posted by chris on Monday, February 15, 2010 at 3:56am.
Wellt the so calles abs: R -> R^+_0 function assigns every x its absolute value hence a positive number or zero.
Squaring a number always yields s.th. positive as a result. It follows the statement.
Yes, since (-x)^2 or x^2 both yield x^2, the square root of X^2 = IxI = absolute value of x.
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