Calculate the determinant of the matrix: | 1 1 1 | | 2 2 2 | | 3 3 3 |

Practice Questions

Q1
Calculate the determinant of the matrix: | 1 1 1 | | 2 2 2 | | 3 3 3 |
  1. 0
  2. 3
  3. 6
  4. 9

Questions & Step-by-Step Solutions

Calculate the determinant of the matrix: | 1 1 1 | | 2 2 2 | | 3 3 3 |
Correct Answer: 0
  • Step 1: Identify the matrix given: | 1 1 1 | | 2 2 2 | | 3 3 3 |.
  • Step 2: Understand that the determinant is a value that can tell us about the matrix's properties.
  • Step 3: Check if the rows of the matrix are linearly dependent. This means that one row can be made by adding or multiplying the other rows.
  • Step 4: Notice that each row is a multiple of the others. For example, the second row (2, 2, 2) is 2 times the first row (1, 1, 1), and the third row (3, 3, 3) is 3 times the first row.
  • Step 5: Since the rows are linearly dependent, the determinant of the matrix is 0.
  • Determinant of a Matrix – The determinant is a scalar value that can be computed from the elements of a square matrix and provides important properties about the matrix, such as whether it is invertible.
  • Linear Dependence – Rows (or columns) of a matrix are linearly dependent if at least one row (or column) can be expressed as a linear combination of others, which implies that the determinant is zero.
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