If a = 2.234, b = 3.121 and c = –5.355, then the value

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If a = 2.234, b = 3.121 and c = –5.355, then the value of a³ + b³ + c³ - 3abc is

Using Rule 21,
a = 2.234, b = 3.121 and c = -5.355
a + b + c = 2.234 + 3.121 – 5.355 = 0
∴ a³ + b³ + c³ – 3abc = 0