help!

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help! Anonymous Wed Oct 24 14:37:36 2012 No.5188034 [Reply] [Original]

Let vector A=(1,2) Determine matrix [perp onto a]
I dont even know where to start anything to get me started would be appreciated.

>>	Anonymous Wed Oct 24 14:39:35 2012 No.5188040 First choose a basis for which the matrix is trivial to find. Then use the change of basis formula to get the matrix in the usual basis.

>>	Anonymous Wed Oct 24 15:00:35 2012 No.5188100 im sorry, im sure this seems stupid, but when you say choose a basis how do i do that?

>>	Anonymous Wed Oct 24 15:02:21 2012 No.5188104 >>5188100 Use the axiom of choice.

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