Solution Found!
Combine the methods of row reduction and
Chapter 3, Problem 11E(choose chapter or problem)
QUESTION:
Problem 11E
Combine the methods of row reduction and cofactor expansion to compute the determinants in Exercises
Questions & Answers
QUESTION:
Problem 11E
Combine the methods of row reduction and cofactor expansion to compute the determinants in Exercises
ANSWER:
Solution 11E
Consider the determinant:
First use row replacement to create zeros in the second column. Add -2 times the first row to the fourth row.
Since three elements of second column is zero, expand down the second column.
For cofactor expansion across second column, determinant of 4x4 matrix is
det A= a12 C12 + a22