Question

7 -6 2

If A = 6
6 -5 -7
2
-8
8
and B =
CERE
-8 -7 5
-1
-9
5
9 -4
7, find A + B.

Answer 1

To find A + B, we need to add the corresponding entries of A and B. That is,

A + B = [a_ij + b_ij],

where a_ij and b_ij are the entries of A and B, respectively, in the ith row and jth column.

Using this formula, we get:

A + B = 7 + (-8) -6 + (-7) 2 + 5

6 + (-1) 6 + (-9) -5 + 4

-5 + 9 -7 + 5 8 + (-4)

= -1 -7 7

5 1

4

Therefore, A + B is the matrix:

-1 -7 7

5 1

4