1. is Symmetric Matrix ?
`[[4,2,0],[2,3,1],[0,1,5]]`
Solution:
A square matrix `A=[a_(ij)]` is said to be a symmetric if `A = A^T` i.e. `a_(ij) = a_(ji)` for all i,j.
`A` | = | | `4` | `2` | `0` | | | `2` | `3` | `1` | | | `0` | `1` | `5` | |
|
`A^T` | = | | `4` | `2` | `0` | | | `2` | `3` | `1` | | | `0` | `1` | `5` | |
| T |
| = | | `4` | `2` | `0` | | | `2` | `3` | `1` | | | `0` | `1` | `5` | |
|
Here, `A` and `A^T` are equal, so `A` is a symmetric matrix
2. is Symmetric Matrix ?
`[[4,2,9],[2,3,1],[0,1,5]]`
Solution:
A square matrix `A=[a_(ij)]` is said to be a symmetric if `A = A^T` i.e. `a_(ij) = a_(ji)` for all i,j.
`A` | = | | `4` | `2` | `9` | | | `2` | `3` | `1` | | | `0` | `1` | `5` | |
|
`A^T` | = | | `4` | `2` | `9` | | | `2` | `3` | `1` | | | `0` | `1` | `5` | |
| T |
| = | | `4` | `2` | `0` | | | `2` | `3` | `1` | | | `9` | `1` | `5` | |
|
Here, `A` and `A^T` are not equal, so `A` is not a symmetric matrix
This material is intended as a summary. Use your textbook for detail explanation.
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