Answer
Given a square matrix, $A$, if a multiple of one row of $A$ is added to another row to produce a matrix $ B$, then det $B$ = det $A$.
Work Step by Step
Given a square matrix, $A$, if a multiple of one row of $A$ is added to another row to produce a matrix $ B$, then det $B$ = det $A$. In this case, 3 times row 1 was added to row 3 to create matrix $B$. Thus, the determinants are the same.
