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# Matrices watch

1. Evaluate
| 1 2 1 |
| 3 5 -2 |
| -2 6 2|
By forming an equivalent determinant with 1 0 0 in first row

Help answer this question and explain how please. (The straight brackets are supposed to show a 3x3 determinant)
2. (Original post by Caikenlol)
Evaluate
| 1 2 1 |
| 3 5 -2 |
| -2 6 2|
By forming an equivalent determinant with 1 0 0 in first row
Surely it's just using elementary row operations. Have you tried this?
3. (Original post by B_9710)
Surely it's just using elementary row operations. Have you tried this?
It isn't for my friend, he has been trying for hours
4. (Original post by B_9710)
Surely it's just using elementary row operations. Have you tried this?
If your goal is to end up with the first row as (1 0 0), surely it will be much easier to use elementary column operations...

5. (Original post by DFranklin)
If your goal is to end up with the first row as (1 0 0), surely it will be much easier to use elementary column operations...

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