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a³ - a⁴ < 0
a³ ( 1 - a ) < 0
_______0 _______1 _____
-1 0,5 2
(-)(+) = (-) | (+)(+) = (+) | (+)(-) = (-)
Se cumple para el intervalo (-∞,0) U (1,∞)
a³ > a⁴
a³ - a⁴ > 0
a³(1-a) > 0
Se cumple para el intervalo (0,1)