Question
If A = then det(A-1) is _____________ (correct to two decimal places).
Answer :
The determinant of the inverse of an invertible matrix is the inverse of the determinant. det (A-1) = 1 / det (A)
A =
Expanding along a11
|A| = 1 (4 - 0) = 4
|A-1| = 1/|A| =1/4 = 0.25
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