SOLUTION: please find: B times C please show step by step B= 5 2 1 1 -3 -1 1 2 4 C= -3 1 2

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Question 151063: please find: B times C
please show step by step
B=
5 2 1
1 -3 -1
1 2 4
C=
-3
1
2
Answer by Fombitz(13823) About Me  (Show Source):
You can put this solution on YOUR website!
When you multiply matrices, you multiply rows of one with columns of the other.
%28matrix%283%2C3%2Ca%2Cb%2Cc%2Cd%2Ce%2Cf%2Ch%2Ci%2Cj%29%29%2A%28matrix%283%2C1%2Cx%2Cy%2Cz%29%29=%28matrix%283%2C1%2Cax%2Bby%2Bcz%2Cdx%2Bey%2Bfz%2Chx%2Biy%2Bjz%29%29
Let's use your numbers.
%28matrix%283%2C3%2C5%2C2%2C1%2C1%2C-3%2C-1%2C1%2C2%2C4%29%29%2A%28matrix%283%2C1%2C-3%2C1%2C2%29%29=%28matrix%283%2C1%2C5%28-3%29%2B2%281%29%2B1%282%29%2C%281%29%28-3%29%2B%28-3%29%281%29%2B%28-1%29%282%29%2C%281%29%28-3%29%2B2%281%29%2B4%282%29%29%29
%28matrix%283%2C3%2C5%2C2%2C1%2C1%2C-3%2C-1%2C1%2C2%2C4%29%29%2A%28matrix%283%2C1%2C-3%2C1%2C2%29%29=%28matrix%283%2C1%2C-11%2C-8%2C7%29%29