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+81a² -81a²
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4a⁴ -20a² +25 -81a² = (4a⁴ -20a² +25 ) -81a²
(2a² -5)² -81a²
( (2a²-5) -9a) ((2a²-5) +9a)
(2a²-5 -9a) (2a²-5+9a)
utlize el metodo del trinomio cuadrado perfecto o completaron del trinomio