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a³+b³ = (a+b)(a² -ab +b²)
a³-b³ = (a-b) (a² + ab + b²)
,..
x³ - 216 = (x-6)(x² +6x +36)
x³+8.000 = (x+20)(x² -20x + 400)
x³-64 = (x-4)(x² + 4x + 16)
x³-729 = (x-7)(x² + 7x+ 49)