Basketweave for 3 × 3 There is a shortcut for finding the determinant of a 3 × 3 matrix. For example, let
,
and repeat the first and second columns to the right of the original three columns:
.
Now, add the products along the downward arrows and subtract the products along the upward arrows, getting
(10 + 0 + 4) − (16 + 0+ 10) = −12.
Check the result for |A| using the cofactor expansion.
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.