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Alien cofactors - PowerPoint PPT Presentation

Ch. 5 Linear Models & Matrix Algebra

Ch. 5 Linear Models & Matrix Algebra. 5.1 Conditions for Nonsingularity of a Matrix 5.2 Test of Nonsingularity by Use of Determinant 5.3 Basic Properties of Determinants 5.4 Finding the Inverse Matrix 5.5 Cramer's Rule 5.6 Application to Market and National-Income Models

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Inverting 3x3 Matrices

Inverting 3x3 Matrices. Consider the matrix . First we need to find the cofactors . These are found by crossing out the row/column of an entry and calculating the 2x2 determinant created, and then finding the correct sign. For instance A 1 the cofactor of a 1 is. Inverting 3x3 Matrices.

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Alien cofactors - PowerPoint PPT Presentation

Ch. 5 Linear Models &amp; Matrix Algebra

Inverting 3x3 Matrices

Ch. 5 Linear Models & Matrix Algebra