If `I` is the identity matrix and `A` is a square matrix such that `A^2=A` , then what is the value of `(I+A)^2-3A` ?

Explanation

To find the value of \((I + A)^2 - 3A\) given that \(A^2 = A\), we can follow these steps:

### Step 1: Expand \((I + A)^2\)

Using the identity \((a + b)^2 = a^2 + 2ab + b^2\), we can expand \((I + A)^2\):

\[
(I + A)^2 = I^2 + 2IA + A^2
...