1. The problem statement, all variables and given/known data Shown In the picture. I went to the prof for help he said and i quote :" don't use laplas expansion to find the determinate, it will take you for ever." 2. Relevant equations I don't even know how to do this. prof had no notes on this and Boas is a god awful book for learning anything. 3. The attempt at a solution Add every row to the last row. 1/last row - every other row. then every row minus the last. but my prof wanted it solved with indices. I dont know what that is or how to apply it as it has never came up.