alleryThe determinant of the 2×2 matrix [[a, b], [c, d]] equals:
A$ad + bc$ (sum of products)
B$a + d - b - c$ (sum and difference)
C$abcd$ (product of all)
D$ad - bc$ (cross-multiplication difference)
Answer & Solution
Correct answer: D. $ad - bc$ (cross-multiplication difference)
2×2 determinant: ad − bc.
This is the foundation
for larger matrices, use cofactor expansion (Laplace's rule) or row reduction.
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