Question

HELP PLEASE

Answer 1

Given : Matrix & Vector multiplication

Matrix and vector can be multiplied if number of columns in one = number of rows in the other. .

Multiplying a vector of (1 row , 3 columns) with matrix of (3 rows, 3 columns) : will give a product matrix of (1 row, 3 columns) - calculated by multiplying each  row with each column

[4 1 2]  x   [ 4  3 2

                  1  5  3

                  1  3  6]

= [ (4)(4) + (1)(3) + (2)(2)         (4)(1) + (1)(5) + (2)(3)    (4)(1) + (1)(3) + (2)(6) ]

[ 16 + 3 + 4                          4 + 5 + 6                        4 + 3 + 8 ]

Resultant product vector : [23    15    15]  

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