The elements are
[tex]a=2,b=11,c=11,d=-2[/tex]
EXPLANATION
We multiply Matrix A by B
to obtain. The matrix above. See attachment.
Since the two matrices are equal, their corresponding elements are equal.
Therefore we obtain the following equations,
[tex]11a-9b=-77---(1)[/tex]
Then also,
[tex]7a-15b=-151---(2)[/tex]
Solving the two equations simultaneously, gives,
[tex]a=2, b=11[/tex]
Also the following pairs of equations,
[tex]22c+6d=230---(3)[/tex]
[tex]11c-9d=139---(4)[/tex]
will also give,
[tex]c=11, d=-2[/tex]
