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Question
If A = `[(-i, 0),(0, i)]`, then ATA is equal to
Options
`l`
`- iA`
`- l`
`iA`
MCQ
Solution
`- l`
Explanation:
A = `[(-i, 0),(0, i)]`, AT = `[(-i, 0),(0, i)]`
ATA = `[(-i, 0),(0, i)][(-i, 0),(0, i)] = [(i^2, 0),(0, i^2)] = [(-1, 0),(0, -1)] = - l`
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