precalculus matrix

Question

Perform the indicated operation.

1
2
	1	0	0	−2
5	0	−1	8
−2	1	−2	4
+  4
3
	3	0	−1	8
−2	1	−6	4
2	4	0	−8
−  1
3
	9	−6	−1	0
6	4	0	4
0	1	−6	1

Answer 1

OPening brace [ marks the beginning of 3 x 4 matrix...

1/2 * [ 1 0 0 -2 ]

5 0 -1 8

-2 1 -2 4

4/3 * [ 3 0 -1 8

-2 1 -6 4

2 4 0 -8 ]

- 1/3 * [ 9 -6 -1 0

6 4 0 4

0 1 -6 1 ]

THe products are:

[ 1/2 0 0 -1

5/2 0 -1/2 4

-1 1/2 -1 2 ]

[ 4 0 -4/3 32/3

-8/3 4/3 -8 16/3

8/3 16/3 0 -32/3 ]

[ -3 2 1/3 0

-2 -4/3 0 -4/3

0 -1/3 2 -1/3 ]

The total of these matrices are:

3/2 2 -1 29/3

-13/6 0 -17/2 8

5/3 11/2 1 -9