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b times b times b = b3 b plus b plus b = 3b
Sum and difference of two cubes is factored this way : a3 + b3 = (a + b)(a2 - ab + b2) a3 - b3 = (a - b)(a2 + ab + b2)
This is the formula: (a3)+(b3)=(a+b)(a2-ab+b2)
It is 2a-b simplified
(a + b + c) 3 = a3 + b3+ c3+ 3a2b + 3a2c + 3ab2 + 3ac2 + 3b2c + 3bc2 + 6abc