Evaluate:(999)^3
(27)^3-(11)^3
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(999)³ can be evaluated by using the following identity
(a - b)³ = a³ - b³ - 3ab ( a - b)
999 = (1000 - 1)³
a = 1000 and b= 1
using the above identity,
(1000 - 1)³ = 1000³ - 1³ - 3*1000*1(1000 - 1)
=> = 1000³ - 1 - 3000*999
=> 1000000000 - 1 - 2997000
=> 99,70,02,999
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