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Question
If P =`|(1 , 2),(3 , 4)|` , Q = `|(5 , 1),(7 , 4)|` and R = `|(2 , 1),(4 , 2)|` find the value of (R + Q)P
Solution
R + Q = `|(2 , 1),(4 , 2)| + |(5 , 1),(7 , 4)|`
= `|(7 , 2),(11 , 6)|_(2 xx 2)`
(R + Q)P = `|(7 , 2),(11 , 6)| |(1 , 2),(3 , 4)|`
`= |(7 + 6 , 14 + 8),(11 + 18 , 22 + 24)|`
`= |(13 , 22),(29 , 46)|_(2 xx 2)`
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