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MIT 18.06 Linear Algebra, Spring 2010 28 Online
OpenStudy (anonymous):

Anyone know how to pull out (1-L)(1+L) from [ 2-L 1 1; 2 3-L 4; -1 -1 -2-L] ? All i know is you subtract column 2 from column 1 and column 3 from column 2.

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