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Question
Evaluate the following :
`|(2,1) ,(3,2),(1 , 1)| |(1 , -2 , 1),(2 , 1 , 3)|`
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Solution
`|(2,1) ,(3,2),(1 , 1)|_(3 xx 2) |(1 , -2 , 1),(2 , 1 , 3)|_(2 xx 3)`
`= |(2+2 , -4+1 , 2 + 3),(3 + 4 , -6+2 , 3 + 6),(1 + 2 , -2 + 1 , 1 + 3)|`
`= |(4 , -3 , 5),(7 , -4 , 9),(3 , -1 , 4)|_(3 xx 3)`
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