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Sum
If A = `[(7, 3, 1),(-2, -4, 1),(5, 9, 1)]`, find (AT)T.
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Solution
A = `[(7, 3, 1),(-2, -4, 1),(5, 9, 1)]`
∴ AT = `[(7, -2, 5),(3, -4, 9),(1, 1, 1)]`
∴ (AT)T = `[(7, 3, 1),(-2, -4, 1),(5, 9, 1)]` = A.
Concept: Algebra of Matrices
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