For a 2x2 matrix with entries a, b (top row) and c, d (bottom row), what is the determinant formula?
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ad - bc
The value 'ad - bc' determines if the matrix is invertible; if it is zero, the matrix is singular. Geometrically, it represents the area of the parallelogram formed by the column vectors of the matrix.
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- Given a 2x2 matrix with top row [a b] and bottom row [c d], what expression yields its determinant?