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If \( B = \begin{pmatrix} 1 & 2 \\ 2 & 4 \end{pmatrix} \), what is \( |B

Practice Questions

Q1
If \( B = \begin{pmatrix} 1 & 2 \\ 2 & 4 \end{pmatrix} \), what is \( |B| \)?
  1. 0
  2. 1
  3. 2
  4. 3

Questions & Step-by-Step Solutions

If \( B = \begin{pmatrix} 1 & 2 \\ 2 & 4 \end{pmatrix} \), what is \( |B| \)?
Correct Answer: 0
  • Step 1: Identify the matrix B, which is given as B = [[1, 2], [2, 4]].
  • Step 2: Recall the formula for the determinant of a 2x2 matrix, which is |B| = ad - bc, where the matrix is [[a, b], [c, d]].
  • Step 3: In our matrix, a = 1, b = 2, c = 2, and d = 4.
  • Step 4: Substitute the values into the determinant formula: |B| = (1 * 4) - (2 * 2).
  • Step 5: Calculate the values: 1 * 4 = 4 and 2 * 2 = 4.
  • Step 6: Now, subtract the second result from the first: 4 - 4 = 0.
  • Step 7: Conclude that the determinant |B| is 0.
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