Evaluate the determinant | 1 1 1 | | 2 2 2 | | 3 3 3 |.

Practice Questions

Q1
Evaluate the determinant | 1 1 1 | | 2 2 2 | | 3 3 3 |.
  1. 0
  2. 1
  3. 2
  4. 3

Questions & Step-by-Step Solutions

Evaluate the determinant | 1 1 1 | | 2 2 2 | | 3 3 3 |.
Correct Answer: 0
  • Step 1: Write down the matrix: | 1 1 1 | | 2 2 2 | | 3 3 3 |.
  • Step 2: Identify the rows of the matrix: Row 1 is [1, 1, 1], Row 2 is [2, 2, 2], and Row 3 is [3, 3, 3].
  • Step 3: Check if the rows are linearly dependent. This means that one row can be made by adding or multiplying the others.
  • Step 4: Notice that Row 2 is just Row 1 multiplied by 2, and Row 3 is Row 1 multiplied by 3.
  • Step 5: Since the rows are linearly dependent, the determinant of the matrix is 0.
  • Determinants – A 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 the others, which results in a determinant of zero.
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