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Question
Choose the correct alternative:
If A + I = `[(3, -2),(4, 1)]`, then (A + I)(A – I) is equal to
Options
`[(-5, -4),(8, -9)]`
`[(-5, 4),(-8, 9)]`
`[(5, 4),(8, 9)]`
`[(-5, -4),(-8, -9)]`
Solution
`[(-5, -4),(8, -9)]`
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