Choose the correct options for the following questions.
The diagonal containing the entries $a_{11},a_{22},a_{33}.....a_{mn}$ in a square root matrix $A=[a_{mn}]$ is called then
Difficulty: Easy
A:
Identity matrix
B:
Square matrix
C:
Row matrix
D:
Principal diagonal
If $\begin{bmatrix}a+b & c+d \\c-d & a-b \end{bmatrix}=\begin{bmatrix}6 & 8 \\12 & 4 \end{bmatrix}$ then c=?
Difficulty: Easy
A:
5
B:
10
C:
12
D:
20
If $\begin{bmatrix}a & c+d \\c-d & a+b \end{bmatrix}=\begin{bmatrix}3 & 5 \\9 & 10 \end{bmatrix}$ then b=?
Difficulty: Easy
A:
2
B:
8
C:
13
D:
7
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