CBSE - XII Science - Mathematics - Vector Algebra
sir/mam pls give me best TRICK to FIND INVERSE OF A MATRIX (EXPLAIN)
The SURE and straightforward method would be by adjoint.
To find inverse of a given matrix A, follow the steps.
Cofactor of an element aij = (-1)i+j x determinant obtained after excluding the ith row and jth column.
1/ Find the cofactors of all the elements.
2/ Replace all the elements in the matrix by their cofactors.
3/ Take the transpose of the matrix, and it's the adjoint of the given matrix A, denoted by adj(A).
4/ Divide adj(A) by determinant of A, and you'll have the inverse of A.
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