The given matrices are: A = [ array*20c 2 &0&0 0& 2 &0 0&0& 2 array ],B = [ array*20c 2&0&0 0&1&0 0&0& - 5 array ]
Here's the idea in simple terms: solving fully: apply relevant formula, put numbers, compute. Result comes as A is scalar matrix and B is a diagonal matrix. Easy verification shows it satisfies condition.
Ref: NCERT Mathematics Class XII — Matrices and Determinants
