Question

find the inverse of [2 (-1) 0, 1 0 4 , 1 1 1] by adjoint method​

Answer 1

Step-by-step explanation:

Let A=⎣⎢⎢⎡100220345⎦⎥⎥⎤ 

∴∣A∣=⎣⎢⎢⎡100220345⎦⎥⎥⎤  

=1(10−0)−0+0 

=1(10)−0+0 

=10=0

∴A−1 exists.

First we have to find the co factor matrix

=[Aij]3×3, where Aij=(−1)i+jMij 

Now, A11=(−1)1+1M11=∣∣∣∣∣∣2045