Question

Find the inverse of the matrix
1 2 −1
3 8 2
4 9 −1​

Answer 1

Answer:

-26 7 12

-11 3 5

-5 1 2

Step-by-step explanation:

Inverse of A=1/|A|×adjA

|A|=1(-8-18)-2(-3-8)-1(27-32)

=-26+22+5=1

adjA:-

-26 7 12

-11 3 5

-5 1 2