Question

7 47 1 2 3 b) Find the inverse of the matrix B slution- Multiply these two matrices: 0 7 1 -3 II 5 0 0 7 0 0 0 3 0 0 4 0 0 0 2 -1 oo

Answer 1

For finding inverse of Matrix,first we find determinant of that matrix.If determinant is non zero then inverse is exist and then inverse is find by help of the formula.

Multiplication of two matrix is possible if number of columns of first matrix is equal to the number of rows of second matrix.

The whole process is given below ?

solution? We need to find the inverse of matrin B 17 41 ) a 21-8=1380 Herer det.(B) = ? Hence. Å exist for 181 finding adjoint of B ie adg (B). let c be the mattin, whose each entries are cofactor of corresponding entries of B: Home as 3] Then adj (B) = CT = granspose of a 3 -2 -4 7 Hence ne adj B 3 -41 13-27 - 372 -413 1 Mis Note Tofactor of . ais =(-1) s 7 o071 um! 10 34 0 -3 07 0 2 15 -15 14-1 I QOW odom 1=1-3 o 121 queshon! ale do multiplication as we multiply first row of 1 column of then sum and write a at first matta with first second mait rin and position au t he raultiply first row of first matron with - second Column of se and mathin and write - at position air. and so on. Schened with CamScannel!? 5X1 + XD Fox-FoX025 en nas and soch,