Answer:
Let
is non-singular
matrix, so A?1 exists.
is
non-singular, so A?1 exists.
A11 =
(?1)1+1(?3 ? 0) = ?3;
A12 =
(?1)1+2(?3 ? 0) = 3;
A13 =
(?1)1+3(6 ? 15) = ?9;
A21 =
(?1)2+1(0 ? 0) = 0;
A22 =
(?1)2+2(?1 ? 0) = ?1;
A23 =
(?1)2+3(2 ? 0) = ?2;
A31 =
(?1)3+1(0 ? 0) = 0;
A32 =
(?1)3+2(0 ? 0) = 0;
A33 =
(?1)3+3(3 ? 0) = 3;
Now
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