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(4+2b+2b+b²)(2+b)
(4+4b+b²)(2+b)
8 + 8b + 2b² + 4b + 4b² + b³
b³ + 4b² + 2b² + 12b + 8
b³ + 6b² + 12b + 8
aplicando binomio cubo: (a + b)^3 = a^3 + 3a^2b + 3a b^2 + b^3
(2+b) (2+b) (2+b) = (2+b)^3
= (2^3 + 3(2)^2(b) + 3(2)(b)^2 + b^3)
= 8 + 3(4)b + 6b^2 + b^3
= 8 + 12b + 6b^2 + b^3
= b^3 + 6b^2 + 12b + 8
Saludos...