Question 156048
You mention A and B but assume you mean H and E??
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{{{H=(matrix(2,2,4,3,2,0))}}}
{{{E=(matrix(2,2,3,6,2,3))}}}
{{{D=H+E=(matrix(2,2,7,9,4,3))}}}
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The inverse of a 2x2 matrix, A,
{{{A=(matrix(2,2,a,b,c,d))}}}
is given by 
{{{A^(-1)=DELTA*(matrix(2,2,d,-b,-c,a))}}}
where
{{{DELTA=1/(ad-bc)}}}
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In this case,
{{{DELTA=1/(7*3-9*4)=-1/15}}}
{{{D^(-1)=DELTA*(matrix(2,2,3,-9,-4,7))}}}
The [11] element would be {{{(-1/15)3=-1/5}}}
That's not a given choice. 
Please check the problem setup and re-post the question.