Question

Determinant of 3 x 3 matrix having first row [ 1 2 5], second row [ 3 5 7] and third row [ 4 5 0] will be ________.

Answer 1

Answer:

-14

i have found this determinant by considering 1st element of 1st row and 1st column then hide 1st column and 1 st row and multiply by 1st entry of 1 st column and 1 st row u will get 1(5×0- 7×5) similarly u can proceed further

Answer 2

Answer:

I think answer should be -4

Explanation:

|A| = 1(0-35) - 2 (0-28) + 5 (15-20)

|A| = -35 + 56 - 25

|A| = -60 + 56

|A| = -4