For (x + 6)2 you would add six a second time which is 12 then 12 times 2 is 24
For (x - 3)2 is 3 times 2 is 6 then subtract 3 is 3
For (x - 6)2 is 2 times 6 is 12 then subtract 6 which is 6
For (x + 3)2 you would do 3 times 2 is six then add three more is 9
QUICK NOTE IM REALLY SORRY IF THIS IS WRONG IM BAD AT MATH PLEASE DONT BE MAD