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Basis for the column space of A problem:
For #3(a) [ http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf ], how did the solution go from U to R? when c != 3
 one year ago
 one year ago
Basis for the column space of A problem: For #3(a) [ http://ocw.mit.edu/courses/mathematics/1806sclinearalgebrafall2011/axbandthefoursubspaces/exam1/MIT18_06SCF11_ex1s.pdf ], how did the solution go from U to R? when c != 3
 one year ago
 one year ago

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s3aBest ResponseYou've already chosen the best response.0
It seems c was chosen to be 4 but why?
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
divide the second row by (c3)
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
subtract row2 from row1
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
c was not chosen to be 4
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I get this: http://i.imgur.com/RIZgXlJ.jpg
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Wait, I think we're miscommunicating. I meant that as in I did what you said and there are still "c"s floating around.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
well subtract (4/(c3))(row3) from row2 and subtract (2+4/(c3))(row3) from row1
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
i think you should look again row reduced echelon form
 one year ago

s3aBest ResponseYou've already chosen the best response.0
but wouldn't that have the position which currently has the leading ones' with "c"s?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Also, sorry for being slow right now, my brain is being overworked and I can't take a break because I have exams.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
look at the picture you uploaded
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
to get the row reduced echelon form, you will make everything zero above pivots right?
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Yes, I see it. :D Let me just confirm, I get the same answer.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
well since row3 is 1 1 it will remove same things above ok i see you got it
 one year ago

s3aBest ResponseYou've already chosen the best response.0
I've confirmed that I got it. :D Thanks a lot.
 one year ago

s3aBest ResponseYou've already chosen the best response.0
"row 3 is 1 1" is what made me see it instantly.
 one year ago

ingenuusBest ResponseYou've already chosen the best response.1
good luck on your exam! :)
 one year ago

s3aBest ResponseYou've already chosen the best response.0
(Also, good luck on yours if you have any.)
 one year ago

s3aBest ResponseYou've already chosen the best response.0
Actually, I have another question. Why does it matter what c is equal to if it dissapears thanks to elimination? (Sorry if that's a dumb question.)
 one year ago
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