- #1
LaraCroft
- 14
- 0
Homework Statement
If a 4x4 matrix A with rows v1, v2, v3 and v4 has determinant detA =-2
then
then det (v1, 9v2+5v3, 5v2+8v3, v4) =___?
Homework Equations
The Attempt at a Solution
Ok, so I think it should be -18 (since 9 x -2). I mean the determinant should not change when adding columns to each other, however multiplying should have an effect, but I am not quite sure what happened to the v3, like do I multiply the determinant by 8, or 5, or none?