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Question
Classify the following matrix as, a row, a column, a square, a diagonal, a scalar, a unit, an upper triangular, a lower triangular, a symmetric or a skew-symmetric matrix:
`[(10, -15, 27),(-15, 0, sqrt(34)),(27, sqrt(34), 5/3)]`
Solution
Let A = `[(10, -15, 27),(-15, 0, sqrt(34)),(27, sqrt(34), 5/3)]`
∴ AT = `[(10, -15, 27),(-15, 0, sqrt(34)),(27, sqrt(34), 5/3)]`
∴ AT = A, i.e., A = AT
∴ A is a symmetric matrix.
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