Mathematics · Matrices
If A = ⌈ 0, -i ⌉ and B = ⌈ 1, 0 ⌉ (where i2 = -1) are matrices, then AB + BA is: [Note: A = [[0, -i], [i, 0]] and B = [[1, 0], [0, -1]]]
- 1a null matrix✓
- 2a unit matrix
- 3an invertible matrix
- 4a diagonal matrix
Correct answer
a null matrix
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