If 
and 
find a matrix X such that A + 2B + X = O.
Given, 
We need to a matrix X such that, A +2B + X = 0
We have, X = -(A + 2B),
1
If and find a matrix X such that A + 2B + X = O.
Given,
We need to a matrix X such that, A +2B + X = 0
We have, X = -(A + 2B),