Math 210-01: Linear Algebra: Reading Homework 3.2

1. Evaluation of Determinants : what point does the book make at the beginning of the section?
   
   1. Elementary Row Operations and Determinants : what is the effect of each of the elementary row operations on the determinant of a matrix?
      
      1. rows and columns : how are your conclusions above different if you choose to work with columns instead of rows?
         
      2. zero determinants : under what circumstances could a matrix have a zero determinant?
         
      3. usefulness : why might we choose to use elementary row operations before finding the determinant of a matrix? how do the calculations required for cofactor expansions compare with those for row reduction?