SOLUTION: If A is a non singular matrices of order 3 and |A|=-3 find |adj. A|
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Question 1021823: If A is a non singular matrices of order 3 and |A|=-3 find |adj. A|
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
by a property of the adjoint operator.
==> , where n = 3.
Proof.
For an invertible nxn matrix,
==> ,
the last equation arising from the determinant of a scalar matrix and the identity matrix.
==> , since
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