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Question
Choose the correct answer from the given four options :
If A = `[(3, 1),(-1, 2)]`, then A2 =
Options
`[(8, 5),(-5, 3)]`
`[(8, -5),(5, 3)]`
`[(8, -5),(-5, -3)]`
`[(8, -5),(-5, 3)]`
Solution
A = `[(3, 1),(-1, 2)]`
A2 = A x A = `[(3, 1),(-1, 2)][(3, 1),(-1, 2)]`
= `[(9 + (-1), 3 + 2),(-3 - 2, -1 + 4)]`
= `[(8, 5),(-5, 3)]`.
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