If A and B are two square matrices such that B=−A−1BA, then (A+B)2 is equal to

If A and B are two square matrices such that B=−A−1BA, then (A+B)2

1.	If A and B are two square matrices such that B=−A−1BA, then (A+B)2 is equal to
Answer» If A and B are two square matrices such that $B = - A^{- 1} B A$ , then $(A + B)^{2}$ is equal to