Question: 4 1 [ 9 is a unit in the ring Mat2x2 (Z). Find a matrix B M(Z) that is not a unit in Mat22(Z),

4 1 [ 9 is a unit in the ring Mat2x2 (Z). 

4 1 [ 9 is a unit in the ring Mat2x2 (Z). Find a matrix B M(Z) that is not a unit in Mat22(Z), but is a unit in Mat2x2(Q). 2 Show that A =

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