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Question
Find matrix A, if `[[1 2 -1],[0 4 9]]`
`+ A = [[9 -1 4],[-2 1 3]]`
Solution
Here,
`A= [[9 -1 4],[-2 1 3]]- [[1 2 -1],[0 4 9]]`
`⇒ A = [[9-1 -1-2 4+1],[-2-0 1-4 3-9]]`
`⇒ A= [[8 -3 5],[-2 -3 -6]]`
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