LU Factorization on Ti-89: 3x3 & 4x4 Matrix Solutions

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Math100
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What's the correct command for finding an LU factorization of a 3x3 and 4x4 matrix on Ti-89 graphing calculator? I'm trying to find the correct answers and verify/check my answers for Linear Algebra problems.
 
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TI makes available a PDF of the guidebook for the TI-89 Titanium. It describes how to use the LU command.
 

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