1. The problem statement, all variables and given/known data I have to proove that the determinant of : x a a . . . a a x a . . . a . . . . . . a . . . a a . . . . . x If you get the idea (it's (n x n) with x's along the diagonal and a's everywhere else) That it is (x + (n-1)a)(x - a)^(n-1) I really don't have a clue how to do this so any hints appreciated.