Matematika I-2-12-2013-R ..
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Transcript of Matematika I-2-12-2013-R ..
MateriMatematika I
Inderalaya, 2 Desember 2013
Program Studi Teknik MesinFakultas Teknik
Universitas Sriwijaya
2013
INVERS SUATU MATRIK BUJUR SANGKAR
Invers suatu matrik bujur sangkar A dapat dituliskan sebagai A-1, dan dapat
dicari dengan rumus:
A-1 = adjoin A
dimana: adjoin A = transpose dari matrik kofaktor A
Misal: A =
Misalkan: matrik kofaktor A = C =
dimana:
k11 = = 0 – 24 = – 24 ; k12 = - = -(0 – 6) = 6 ; k13 =
= 16 – 1 = 15
k21= - = -(0 – 20) = 20 ; k22 = = (0 – 5) = -5 ; k23 = -
= -(8 - 3) = -5
k31= = (18 – 5) = 13 ; k32 = - = -(12 – 20) = 8 ; k33 = =
(2 - 12) = -10
Jadi: C = = matrik kofaktor A
Transpos C = CT =
Adjoin A = CT
det A = = = 2 (0 – 24) – 3 (0 – 6) + 5 (16 – 1) = - 48 +
18 + 75 = 45
Sehingga: A-1 = adjoin A =