Question

Find the value of the following determinant:
67 19 20
39 13 14
81 24 25​

Answer 1

Answer:

-56

Step-by-step explanation:

=67(25×13-14×24)-19(39×25-81×14)+20(39×24-13×81)

=67(325-336)-19(975-1134)+20(936-1053)

=67×(-11)-19(-159)+20(-117)

=-737+3021-2340

=-56