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Use the square's rule to find the determinant of B = [[2, 5, 1], [6, 0, 4], [-2, -3, 3]]

Mathematics

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2 parts
1
-124
2
-124

Step-by-step solution

5 steps

Part 1· 4 steps

Use Sarrus' rule to find the determinant of B

  1. Write down the matrix B and extend it with the first two columns.

    B=[251604−2−33]B = \begin{bmatrix} 2 & 5 & 1 \\ 6 & 0 & 4 \\ -2 & -3 & 3 \end{bmatrix}

    To apply Sarrus' rule, we repeat the first two columns next to the matrix:

    ∣251604−2−33∣2560−2−3\begin{vmatrix} 2 & 5 & 1 \\ 6 & 0 & 4 \\ -2 & -3 & 3 \end{vmatrix} \begin{matrix} 2 & 5 \\ 6 & 0 \\ -2 & -3 \end{matrix}
  2. Calculate the sum of the products of the main diagonals (top-left to bottom-right).

    (2×0×3)+(5×4×−2)+(1×6×−3)(2 \times 0 \times 3) + (5 \times 4 \times -2) + (1 \times 6 \times -3) 0+(−40)+(−18)=−580 + (-40) + (-18) = -58
  3. Calculate the sum of the products of the anti-diagonals (top-right to bottom-left).

    (1×0×−2)+(2×4×−3)+(5×6×3)(1 \times 0 \times -2) + (2 \times 4 \times -3) + (5 \times 6 \times 3) 0+(−24)+(90)=660 + (-24) + (90) = 66
  4. Subtract the sum of the anti-diagonal products from the sum of the main diagonal products to find det⁡(B)\det(B).

    det⁡(B)=−58−66=−124\det(B) = -58 - 66 = -124

    The determinant of B is −124\boxed{-124}.

Part 2-124

Find ∣BT∣|B^T|

The matrix given for this part is:

BT=[26−250−3143]B^T = \begin{bmatrix} 2 & 6 & -2 \\ 5 & 0 & -3 \\ 1 & 4 & 3 \end{bmatrix}

This matrix is the transpose of matrix B from Part 1. A fundamental property of determinants states that the determinant of a matrix is equal to the determinant of its transpose, i.e., det⁡(A)=det⁡(AT)\det(A) = \det(A^T).

  1. Apply the determinant property.

    Since we found det⁡(B)=−124\det(B) = -124, then det⁡(BT)\det(B^T) must also be −124-124.

    ∣BT∣=∣B∣=−124|B^T| = |B| = -124

    The determinant of BTB^T is −124\boxed{-124}.

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