If A= ( begin{bmatrix}1&3 2&1 end{bmatrix} ), then ________

1.	If A= ( begin{bmatrix}1&3 2&1 end{bmatrix} ), then ________
A.	\|2A\|=4\|A\|
B.	\|2A\|=2\|A\|
C.	\|A\|=2\|A\|
D.	\|A\|=\|4A\|
Answer» B. \|2A\|=2\|A\|

Discussion

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If A= ( begin{bmatrix}1&3 2&1 end{bmatrix} ), then ________
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