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Question
If `[[2 3],[5 7]] [[1 -3],[-2 4]]-[[-4 6],[-9 x]]` find x.
Solution
Given :`[[2,3],[5,7]] [[1,-3],[-2,4]]-[[-4,6],[-9,x]]`
`⇒[[2-6,-6+12],[5-14,-15+28]]=[[-4,6],[-9,x]]`
`⇒[[-4,6],[-9,13]]=[[-4,6],[-9,x]]`
⇒x=13
∴x=13
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