A [ 5 6[ [7 8] then find the determinant of A?
- 2
- -2
- 3
- 4
Explanation
Matrix A =
[ 5 6 ]
[ 7 8 ]
To find the determinant of a 2×2 matrix:
det(A) = (5 × 8) - (6 × 7) = 40 - 42 = -2
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