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Question
If A = `|(1215),(1117)|` and B = `|(2,7),(4,9)|` find A - 2B
Solution
A = `|(12 , 15),(11 , 17)|_(2 xx 2)` , B = `|(2,7),(4,9)|_(2xx2)`
2B = `|(4 , 1 , 4),(8 , 1 , 8)|`
A - 2B = `|(12 - 4 , 15 - 14),(11 - 8 , 17 - 18)|`
`= |(8 , 1),(3 , -1)|_(2 xx 2)`
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