Linear algebra determinant
View Single Post
Oct24-10, 05:30 PM
What if you do 3rd row - 4th row, replacing 4th row.
You're not allowed to do that.
replace the 4th row by adding the 3rd row to the 4th row.
muck about with the row you're replacing (you've multiplied it by -1
you start adding to or subtracting other rows from it.