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3.-x^4 - 16 = (x² - 4) +(x² + 4)
4.-16x^2 - 36y^4 = (4x - 6y^2) (4x+6y^2)
5.-4x^2 −64y^4 = (2x - 8y^2)(2x + 8y^2)
6.- 81x^2 −16y^4 = (9x + 4y^2)(9x− 4y^2)
Espero que tte sirva