What is the cross product of vectors A = (1, 2, 3) and B = (4, 5, 6)?

Practice Questions

Q1
What is the cross product of vectors A = (1, 2, 3) and B = (4, 5, 6)?
  1. (-3, 6, -3)
  2. (0, 0, 0)
  3. (3, -6, 3)
  4. (1, -2, 1)

Questions & Step-by-Step Solutions

What is the cross product of vectors A = (1, 2, 3) and B = (4, 5, 6)?
  • Step 1: Write down the vectors A and B. A = (1, 2, 3) and B = (4, 5, 6).
  • Step 2: Set up the determinant for the cross product using the unit vectors i, j, k and the components of A and B.
  • Step 3: Write the determinant as a 3x3 matrix: |i j k| |1 2 3| |4 5 6|.
  • Step 4: Calculate the determinant by expanding it. This involves calculating the components for i, j, and k.
  • Step 5: For the i component, calculate (2*6 - 3*5) = 12 - 15 = -3.
  • Step 6: For the j component, calculate (1*6 - 3*4) = 6 - 12 = -6, but remember to change the sign, so it becomes +6.
  • Step 7: For the k component, calculate (1*5 - 2*4) = 5 - 8 = -3.
  • Step 8: Combine the components to get the final result: A × B = (-3, 6, -3).
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