Question

Which matrix is the multiplicative inverse of
https://api.agilixbuzz.com/Resz/~Ey6YBAAAAAwCteZjmeboDB.ct5YQSWJoUC7m2i66BI8fB/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2024.jpg

Answer 1

@Loser66 @Kainui

Answer 2

@SolomonZelman

Answer 3

@surjithayer

Answer 4

@robtobey

Answer 5

@Loser66

Answer 6

@surjithayer @Kainui

Answer 7

Det is 1

Answer 8

\[Suppose ~A=\left[\begin{matrix}1 & 0&1 \\ 1 & 1&-9\\0&1&-9\end{matrix}\right]\]
co-factors of elements of first row of |A| are
\[\left|\begin{matrix}1 & -9 \\ 1 & -9\end{matrix}\right|,-\left|\begin{matrix}1 & -9 \\ 0 & -9\end{matrix}\right|,\left|\begin{matrix}1 & 1 \\ 0 & 1\end{matrix}\right|\]
i.e.,0,9,1
similarly find the co-factors of elements of second and then third row

Answer 9

wait I have to find the multiplicative and that doesnt really make sense to me @Loser66 @surjithayer

Answer 10

@wolf1728

Answer 11

@robtobey

Answer 12

https://api.agilixbuzz.com/Resz/~Ey6YBAAAAAwCteZjmeboDB.ct5YQSWJoUC7m2i66BI8fB/19809088,B84/Assets/assessmentimages/alg%202%20pt%202%20u3l5%2025.jpg
This is what I got

Answer 13

@surjithayer
@Loser66

Answer 14

Would that be right?

Answer 15

@surjithayer

Answer 16

this is one way after finding adjoint of A
you want by row transformation
I am leaving now ,i will be here after evening walk.

Answer 17

I got it thanks for the help!