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" 9.If "A=[[2,-3],[-4,7]]," then find "[...

" 9.If "A=[[2,-3],[-4,7]]," then find "[-1," and "" show that "],[2A^(-1),=9I-A]

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Given A= [(2,-3),(-4,7)] , compute A^(-1) and show that 2A^(-1) = 9I-A .

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