11th grade
posted by chris .
Why is square root of x squared = absolute x?
Is it because absolute x = x and x?

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.