Question

Find inverse of a matrix

1 2 1
[ 3 0 1 ]
0 2 1
using adjoint method.

Answer 1

Step-by-step explanation:

Conclusion

The inverse of A is A-1 only when A × A-1 = A-1 × A = I.

To find the inverse of a 2x2 matrix: swap the positions of a and d, put negatives in front of b and c, and divide everything by the determinant (ad-bc).

Sometimes there is no inverse at all.

Answer 2

Answer:

The unit is newton per square meter (N/m^2), kilogram (force) per square centimeter (kg/cm^2) or pascal. Most commonly used unit of strength is pascal, which is defined as force of 1N that is exerted on unit area.