Evaluate the determinant \( \begin{vmatrix} 1 & 2 \\ 3 & 4 \\ 5 & 6

Practice Questions

Q1
Evaluate the determinant \( \begin{vmatrix} 1 & 2 \\ 3 & 4 \\ 5 & 6 \end{vmatrix} \).
  1. 0
  2. 1
  3. 2
  4. 3

Questions & Step-by-Step Solutions

Evaluate the determinant \( \begin{vmatrix} 1 & 2 \\ 3 & 4 \\ 5 & 6 \end{vmatrix} \).
Correct Answer: 0
  • Step 1: Identify the matrix for which we want to find the determinant. The matrix is: [[1, 2], [3, 4], [5, 6]].
  • Step 2: Note that this matrix has 3 rows and 2 columns, which means it is not a square matrix.
  • Step 3: Understand that only square matrices (same number of rows and columns) have a determinant.
  • Step 4: Since the matrix is not square, we cannot calculate a determinant in the traditional sense.
  • Step 5: However, we can observe that the rows of the matrix are linearly dependent, meaning one row can be expressed as a combination of the others.
  • Step 6: Because the rows are linearly dependent, we conclude that the determinant 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 results in a determinant of zero.
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