Question 25
Matrices and DeterminantsIf N = [3 5 −4; 6 −3 −5; −2 2 1] find |N| (matrix written row by row, rows separated by ;)
- A.17
- B.23
- C.65
- D.91
Show the answer and explanation
Answer: A (17)
Explanation
Expand along the first row: 3(−3 + 10) − 5(6 − 10) − 4(12 − 6) = 21 + 20 − 24 = 17.