Question

answer this question​

Answer 1

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:

-2 3

-4 1

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