b^3+3b^2+3b+1/ b : (1/b+1)= (b+1)^3/b : (1+b)/b = (b+1)^3/b * b/(1+b) = (b+1)^2 = b^2 +2b + 1.
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b^3+3b^2+3b+1/ b : (1/b+1)= (b+1)^3/b : (1+b)/b = (b+1)^3/b * b/(1+b) = (b+1)^2 = b^2 +2b + 1.