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Misal A adalah matriks non-singular n x n.<br />

AB = I jika dan hanya jika B =<br />

Bukti<br />

AB = I <br />

<br />

atau AB I<br />

Berarti, jika kita berhasil mengeliminasi menjadi , maka kita dapat memastikan<br />

bahwa X =<br />

Contoh 9.13<br />

Dari contoh 9.12, tentukan<br />

Penyelesaian<br />

dengan metode eliminasi Gauss-Jordan<br />

R 2 –2/3 R 1<br />

R 3 –R 1<br />

R 3 –6/7 R 2<br />

R 1 + 2/3R 2<br />

R 2 +4/7R 3<br />

R 1–9/7R 3<br />

Soal-soal<br />

1. Diketahui matriks-matriks :<br />

a) Tentukan:<br />

i) A + B iv) 2A + 3B – 2C<br />

ii) A – B<br />

v) C T – B<br />

iii) 3(A – B)<br />

vi) A + B T<br />

184

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