Question: For the determinant (13.112), add column 1 to column 3 and add column 2 to column 4. Show that the result is equal to In

For the determinant (13.112), add column 1 to column 3 and add column 2 to column 4. Show that the result is equal to

In this determinant, subtract column 3 from column 1 and subtract column 4 from column 2. Then use column interchanges to show that the result equals (13.113). At each step, state which theorem about determinants is being used.

4 |(1sa + 1s,)(Isa + 1sg)1s,Isal

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