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Matrices

Subtracting Matrices
Find A - B if A=[9  2] and B=[3  6]
                [8 -2]       [-4 7]               
 
 
A - B=[9  2]  -  [3  6]
      [-4 7]     [8 -2]
 
[9-3     2-6]
[-4-8  7-(-2]
 
[6  -4]
[-12 9]

Adding Matrices
a. Find A + B if A= [4 -6] and B = [-3 7]
                          [2  3]            [ 5 -9]
 
A+B=  [4 -6] + [-3 7]
          [2  3]    [ 5 -9]
 
Plug it in
 
and your answer is :
 
[1   1]
[7  -6] 

matrices.jpg

Adding and Subtracting Matrices-You will learn when it is okay to +/- matrices. The person takes it one step at a time.