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( x² + 4 ) ( x)² - (2)² - x^4
( x² + 4) ( x² - 4 ) - x^4
(x²)² - ( 4)² - x^4
x^4 - 16 - x^4
-16 ⇒ Respuesta
( x² + 4 ) ( x)² - (2)² - x^4
( x² + 4) ( x² - 4 ) - x^4
(x²)² - ( 4)² - x^4
x^4 - 16 - x^4
-16
espero que te sirva.