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Aplicas propiedad distributiva
(x² - 4x + 4x - 16) - (16 + 4x - 4x - x²) + 32
(x² - 16) - (- x² + 16) + 32
x² - 16 + x² - 16 + 32
x² + x² - 16 - 16 + 32
2x² - 32 + 32
2x²
Respuesta.
2x²