- #1
vs55
- 21
- 0
Homework Statement
find the determinant using row operations:
1 -2 2
0 5 -1
2 -4 1
Homework Equations
The Attempt at a Solution
i took row 3 and took 2 x row 1 away from it to get :
1 -2 2
0 5 -1
0 0 -3
1 x 5 x (-3) = -15...but i multiplied a row by 2 so i should get -30 for the det right?but the answer in my book is -15..what am i doing wrong?