Question

Let A = CD where C, D are n xn matrices, and is invertible. Prove that DC is similar to A. Hint: Use Theorem 6.13, and unders

Prove that if A is diagonalizable with n real eigenvalues 11, 12,..., An, then det(A) = 11. Ay n

Prove that if A is an orthogonal matrix, then so are A and A.

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Answer #1

cat A cD uoheae invertible Poore Hhat nx matoices , and DC Solution os A CD Cet vetible is A CD c- ACE CCD.c CACE DC ci inreoSolution -A is diagonal izab le Cet 3invetible Such that madix dingon al matrix A pDP D is Dhere eigenvalue diaganal entrej aConsider A AT T ATA T (ATA)TT (A AT )TT ATCATT A. AT AT. A T conside AAT CATA) T (AATT (ATA (AT)AT A-. (AT CAAT Ar. CA-T ost

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