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The cube of A plus B is either A**3 + B or (A + B)**3 depending on what you intended to be cubed.
(a + b+ c)3 = a3 + b3 + c3 + 3a2b + 3ab2 + 3b2c + 3bc2 + 3c2a + 3ca2 + 6abc
a3+b3=(a+b)3-3a2b-3ab2
That depends what the values of k and b are.
2b