anonymous
  • anonymous
can someone help me on this matrix, what is the answer please?
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
if A=\[\left[\begin{matrix}-4 & 5 \\ -2 & 5/2\end{matrix}\right]\] find a non-zero 2 by 2 matrix X such that A·X = O2x2 O2x2 is the 2 by 2 zero matrix.
amistre64
  • amistre64
i remember this one :)
amistre64
  • amistre64
flip your left for rights and negate one side

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amistre64
  • amistre64
thought i rememberd it , gonna have to go back and recall what I did :)
amistre64
  • amistre64
http://www.wolframalpha.com/input/?i=%7B%7B-4%2C5%7D%2C%7B-2%2C5%2F2%7D%7D.%7B%7B-5%2C-5%2F2%7D%2C%7B-4%2C-2%7D%7D
amistre64
  • amistre64
its a counterclockwise rotation and negate the right side stuff ....
amistre64
  • amistre64
\[\begin{pmatrix}a&b\\c&d\end{pmatrix}.\begin{pmatrix}-b&-d\\a&c\end{pmatrix}=0\]
amistre64
  • amistre64
should work with sime scaled version of it as well
amistre64
  • amistre64
with some ....

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