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A + I = [3-241] then find the value of (A + I)(A − I) - Mathematics and Statistics

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Question

A + I = `[(3, -2),(4, 1)]` then find the value of (A + I)(A − I)

Sum
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Solution

A + I = `[(3, -2),(4, 1)]`

∴ A − I = (A + I) − 2I

= `[(3, -2),(4, 1)] - [(2, 0),(0, 2)]`

= `[(1, -2),(4, -1)]`

∴ (A + I) (A – I) = `[(3, -2),(4, 1)] [(1, -2),(4, -1)]`

= `[(3 - 8, -6 + 2),(4 + 4, -8 - 1)]`

= `[(-5, -4),(8, -9)]`

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