Second one is simple.Originally Posted byluckyc1423

Expand it along the first row

You will get

3 multipied by

-2 0 0

2 -1 0

7 2 4

Again expand it along the first row

You wil get

6 multiplied by

-1 0

2 4

Hence determinant of the matrix comes out to be -24.

Keep Smiling

Malay