1.Let the 2x2 matrix be so that
=
This gives 2a +bk= 4+3k
and 2c +dk= 1-k
From the first eq, we get 2a=4 => a=2 and b=3
From the second eq, we get 2c=1 => c=1/2 and d=-1
Hence the desired matrix A would be
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