Calculate the determinant \( \begin{vmatrix} 2 & 3 \\ 5 & 7 \end{vmatrix

Practice Questions

Q1
Calculate the determinant \( \begin{vmatrix} 2 & 3 \\ 5 & 7 \end{vmatrix} \)
  1. 1
  2. 2
  3. 3
  4. 4

Questions & Step-by-Step Solutions

Calculate the determinant \( \begin{vmatrix} 2 & 3 \\ 5 & 7 \end{vmatrix} \)
  • Step 1: Identify the elements of the 2x2 matrix. The matrix is: [[2, 3], [5, 7]].
  • Step 2: Write down the formula for the determinant of a 2x2 matrix: det(A) = ad - bc, where A = [[a, b], [c, d]].
  • Step 3: Assign the values from the matrix to the variables: a = 2, b = 3, c = 5, d = 7.
  • Step 4: Substitute the values into the formula: det(A) = (2 * 7) - (3 * 5).
  • Step 5: Calculate the first part: 2 * 7 = 14.
  • Step 6: Calculate the second part: 3 * 5 = 15.
  • Step 7: Subtract the second part from the first part: 14 - 15 = -1.
  • Step 8: The determinant of the matrix is -1.
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