A is invertible and Determinant problem 

1) A is non-singular matrix then show that A is invertible & A^-1
2)A=| 1 -2 1 |
| 0 1 -1 |,find A^3-3A^2-A-3I
| 3 -1 1 |
3)S.T|a-b-c 2a 2a |
| 2b b-c-a 2b | =
| 2c 2c c-a-b |
(a+b+c)^3
#maths #mathsvedios
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