Need genius math people's help !!!!!

There are two matrices A and B.
A = 4 -6 B= 5 1
4 -2 -1 -3

I want to find a matrix D which satisfies A+B+D=I
and I got below the answer but it said still wrong.
-8 5
-3 6

Please help me people !!!!!!!!!!!!!!!!!

Question

Need genius math people's help !!!!!

There are two matrices A and B. 
A = 4   -6             B= 5     1
      4    -2                  -1   -3

I want to find a matrix D which satisfies A+B+D=I
and I got below the answer but it said still wrong.  
-8     5
-3     6

Please help me people !!!!!!!!!!!!!!!!!

sdfgsdfgs · Answer

I= 1 1
     1 1 right?

if so, then -8 and 6 are right, re-calculate the other two.

anonymous · Answer

Isn't I = 1 0
             0  1 ???

usukidoll · Answer

yes a 2 x 2 identity matrix is 

1   0 
0   1

usukidoll · Answer

hmmm latex for matrices is nasty.. so 

we have this equation 
A+B+D=I

where A and B matrices are given. so we need to find Matrix D

sdfgsdfgs · Answer

@taejunlee sorry u are right of cuz...been a while since i looked at matrix. so ur ans should be right then. may be someone else can help u. good luck! :)

usukidoll · Answer

what if we rearrange this equation for a bit
D =I-A-B like that and then use matrix addition and matrix subtraction ?

usukidoll · Answer

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