a.You cannot add a 22 matrix and a real number because their dimensions are different. Therefore,
the sum is not well–defined.
b.The 1 should be added only to the diagonal entries, so that the correct statement should be
.
c.There is no error.
a.The product is not well–defined because the matrices must have the same dimensions in order to be
multiplied.
b.The correct product should be.
c.There is no error.
91111 C
1
1
.1 1 1 1^1
1
1
1
1
1
1
1
–
–
> H 9 ––––C=> H
1
2
2
3 1
2
2
2
4
––
>>HH+=
1
2
2
3 1
2
3
1
4
––
>>HH+=
