Relación entre un valor absoluto y una raíz cuadrada

|x| = (x²)½

El valor absoluto de x es siempre positivo.

La raíz cuadrada de x² no es siempre positiva.

|x| = (x²)½ = { x si x≥0
-x si x<0

(x²)½ = { x si x≥0
-x si x<0

|x| siempre va a ser igual a (x²)½
Las dos van a depender de x si x≥0 o de -x si x<0

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