Question

3

Answer 1

Answer:

d11 =   -9

d12 =   -27

d13 =   -45

d21 =   -57

d22 =   -171

d23 =   -285

Step-by-step explanation: ed gen u it y

Answer 2

Matrix

matrix is a rule of writing or presenting data consisting of rows and columns in an open or closed parenthesis.

• the problem above is about matrix multiplication

the first type of multiplication :

if k is a constant and A is a matrix, then kA can be operated by multiplying each element of matrix A by the constant k.

ex : 3[-1 2 2] = [-3 6 6]

multiplication of two matrices :

the multiplication of a 1x n matrix and a n × 1 column matrix is a 1 × 1 matrix.

the above problem using matrices of 3 × 1 and 1 × 3 size will produce a 3 × 3 matrix.

Answer :

| 3 | | 9 |

3|19| [-1 -3 -5] =|57| [-1 -3 -5]

|12| |36|

| 9×(-1) 9×(-3) 9×(-5) |

= | 57×(-1) 57×(-3) 57×(-5)|

| 36×(-1) 36×(-3) 36×(-5)|

| -9 -27 -45 |

= | -57 -171 -285|

| -36 -108 -180|