I am understanding whats going on so far generally but I have two specific questions. We will use this example from the book
1.Typically, How can you tell it can be solved by grouping? I can do this method provided the header tells me "solve by grouping" but odds are if a factor grouping problem was put into a test randomly with other factoring problems I wouldnt be able to spot it.
2. I cant seem to remember why at this point the two merge into one. Why are we able to do this again?