Construct a 3×4 matrix A = [ai j] whose elements ai j are given by: ai j = ½ |-3i + j|
Construct a 3×4 matrix A = [ai j] whose elements ai j are given by: ai j = ½ |-3i + j|

Given \[{{a}_{i\text{ }j}}~=\text{ }{\scriptscriptstyle 1\!/\!{ }_2}\text{ }\left| -3i\text{ }+\text{ }j \right|\]

Let \[A\text{ }=\text{ }{{[{{a}_{i\text{ }j}}]}_{2\times 3}}\]

So, the elements in a \[3\times 4\]matrix are

\[{{a}_{11}},\text{ }{{a}_{12}},\text{ }{{a}_{13}},\text{ }{{a}_{14,}}~{{a}_{21}},\text{ }{{a}_{22}},\text{ }{{a}_{23}},\text{ }{{a}_{24}},\text{ }{{a}_{31,~}}{{a}_{32,~}}{{a}_{33,~}}{{a}_{34}}\]

\[A\text{ }=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 81

\[{{a}_{11}}~=\]

RD Sharma Solutions for Class 12 Maths Chapter 5 Image 82

\[{{a}_{12}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 83

\[{{a}_{13}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 84

\[{{a}_{14}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 85

\[{{a}_{21}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 86

\[{{a}_{22}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 87

\[{{a}_{23}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 88

\[{{a}_{24\text{ }=}}\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 89

\[{{a}_{31}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 90

\[{{a}_{32}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 91

\[{{a}_{33}}~=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 92

\[{{a}_{34}}~=\]

RD Sharma Solutions for Class 12 Maths Chapter 5 Image 93

Substituting these values in matrix A we get,

\[A\text{ }=\]
RD Sharma Solutions for Class 12 Maths Chapter 5 Image 94

Multiplying by negative sign we get,