find inverse of [3 1 - Maths -

Question

find inverse of [3 1
2 4]if it exits

Manbar Singh · Accepted Answer

Let A = 3124Now , A = 3124 = 12-2 = 10Since  A ≠0 , So A-1  exists
Let Aij  be the cofactors of aij  in A
Now , A11  = -12 ×4 = 4            A12 = -13 ×2 = -2           A21  = -13 ×1 = -1            A22 = -14  ×3 = 3Now , AdjA = 4-1-23Now , A-1 = AdjAA = 110 4-1-23

find inverse of [3 1 2 4]if it exits

find inverse of [3 1
2 4]if it exits