Matrices and Determinants Assignment Help

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Matrices:

 A rectangular array of symbols (which may be complex or real numbers) along columns and rows is known as matrix.

Therefore a system of m ´ n symbols given in a rectangular creation along m rows and n columns and surrounded by the brackets [.] is known as an m by n matrix (which is defined as m x n matrix).

Therefore 56_matrix.png                                  

Determinants:

  • Suppose the equations a1x+b1y = 0 and a2x+b2y = 0. These provides

1452_matrix1.png

We express that eliminate as342_matrix2.png = 0.

  • 1369_matrix7.png
  • A determinant of order three having of 3 rows and 3 columns is shown as 342_matrix2.png  and is same to

The numbers ai, bi, ci  ( i =1,2,3 ) are known as the elements of the determinant.

The determinant calculating by removing the ith row and jth column is known as the minor of the component at the ith row and the jth column. The co-factor of this component is (-1)i+j  (minor). 

      Noticed that : Δ = 650_matrix3.png= a1A1 + b1B1+c1C1

      where A1, B1 and C1 are the co-factors of a1, b1 and c1 respectively. i.e., the addition of products of the components of any row (column) of a determinant with the related co-factors is same to the value of the determinant.

We may expand the determinant through any column or row. It denotes that we may write:

1382_matrix8.png

781_matrix6.png

These expression are true for determinants of any order.

 

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