Question:
If $A$ and $B$ are square matrices of the same order then $(A+B)^{2}=$ ?
A. $A^{2}+2 A B+B^{2}$
B. $A^{2}+A B+B A+B^{2}$
$C \cdot A^{2}+2 B A+B^{2}$
D. none of these
Solution:
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