anonymous
  • anonymous
suppose A is a (3x1) nxm matrix such that A= (-4) (0) (0) = (3x1) matrix: (36) (12) (-4) what is the first column of A?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
your question isnt really clear, perhaps you could use the LaTex equation writer in a comment to write the matrices out properly? then i can help.
anonymous
  • anonymous
suppose that A is an nxm matrix such that A= \[\left[\begin{matrix}-4 \\ 0\\0\end{matrix}\right]\] = \[\left[\begin{matrix}36 \\ 12 \\-4\end{matrix}\right]\] what is the first column of A?
anonymous
  • anonymous
im sorry, i cant see how that works, how can A be both of those things?

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anonymous
  • anonymous
here's a screenshot of the problem to make it more clear
anonymous
  • anonymous
aaah i understand now, A is multiplied by the first matrix to get the second
anonymous
  • anonymous
let\[A= \left( \begin{array}{ccc} a & b & c \\ d & e & f \\ g & h & i \end{array} \right)\] now do you know how matrix multiplication works?
anonymous
  • anonymous
matrices are only compatible for multiplication if this is true: if matrix A is n x m and matrix B is p x q , then m = p also the product of A and B will be of order n x q therefore we can deduce A must be 3 x 3
anonymous
  • anonymous
ok, thank you

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