 Hello and welcome to the session. In this session, we discussed the following question which says, simplify the following 4ab into a minus b minus 6a square into b minus b square minus 3b square into 2a square minus a plus 2ab into a minus b. Let's move on to the solution. We need to simplify the expression 4ab into a minus b minus 6a square into b minus b square minus 3b square into 2a square minus a plus 2ab into a minus b. So this is equal to, first we multiply 4ab with each term of this bracket that is we have 4ab into a plus 4ab into minus b. In the same way we multiply minus 6a square with each term of this bracket that is we have minus 6a square into b minus 6a square into minus b square. Then again in the same way we will multiply minus 3b square with each term of this bracket so we have minus 3b square into 2a square minus 3b square into minus a. Then we will multiply 2ab with each term of this bracket so we have plus 2ab into a plus 2ab into minus b. So this is equal to now 4ab into a is 4a square b then minus 4ab into b is 4ab square minus 6a square b as 6a square into b 6a square b plus 6a square b square. We multiply 6a square and b square we get 6a square b square minus 6a square b square multiplying 3b square and 2a square. Now plus 3ab square that is we get this one multiplying 3b square and a plus 2a square b we get this one multiplying 2ab and a minus 2ab square we get this one multiplying 2ab and b. Now 6a square b square and minus 6a square b square cancels so we will take the like terms together. So we have 4a square b minus 6a square b plus 2a square b let this be in one bracket then plus minus 4ab square plus 3ab square minus 2ab square. So this is equal to 6a square b minus 6a square b plus minus 6ab square plus 3ab square and so this is equal to 6a square b and minus 6a square b cancels. So here we will be left with minus 6a b square plus 3ab square and so this comes out to be equal to minus 3ab square. So this is our final answer minus 3ab square this completes the session hope you have understood the solution for this question.