Question

hey mate please answer my question​

Answer 1

Answer:

It is "square" (has same number of rows as columns),

It has 1s on the diagonal and 0s everywhere else.

Its symbol is the capital letter I.

The Identity Matrix can be 2×2 in size, or 3×3, 4×4, etc ...

Definition

Here is the definition:

The inverse of A is A-1 only when:

A × A-1 = A-1 × A = I

Sometimes there is no inverse at all.

2x2 Matrix

OK, how do we calculate the inverse?

Well, for a 2x2 matrix the inverse is:

matrix inverse 2x2 determinant