Determinant Prove...2

[mathdad]

Multiply each entry in row 2 of a 3 by 3 determinant by the number k, k ≠ 0. Show that the value of the new determinant is k times the value of the original determinant. How is this done?

 

[Romsek]

see my other answer regarding determinants

 

[Dr.Peterson]

Multiply each entry in row 2 of a 3 by 3 determinant by the number k, k ≠ 0. Show that the value of the new determinant is k times the value of the original determinant. How is this done?

Again, maybe expansion by minors can be used. Do you know anything about that? If so, use row 2!

Incidentally, this will still be true even if k = 0 (though less useful!).