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MIT 18.06 Linear Algebra, Spring 2010 9 Online
OpenStudy (anonymous):

In section 2.4 #11, can someone help me understand why the answer to b) BA = 4B is B=0? I don't see how the zero matrix over A yields 4 times itself..I know I am probably missing something fundamental. thanks

OpenStudy (anonymous):

Anything multiplies 0 is 0, hence BA = 4B = 0 when B = 0.

OpenStudy (anonymous):

thank you jiayao -- doesn't get more fundamental than that..problems with my brain on that one

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