Question 63238
(5b^3 - 8b + 2b^2) + (3b^2 - 7b^3 + 5b) 

Remove the brackets, we get

5b^3 - 8b + 2b^2 + 3b^2 - 7b^3 + 5b


Group with all the like terms together, we get

5b^3 - 7b^3 + 2b^2 + 3b^2- 8b + 5b

Add all the like terms, we get

-3b^3 + 5b^2 -3b