Home
Class 12
MATHS
find the cofactor of a(23) in [(3,1,4),(...

find the cofactor of` a_(23)` in `[(3,1,4),(0,2,-1),(1,-3,5)]`

Text Solution

Verified by Experts

Let `A=[(3,1,4),(0,2,-1),(1,-3,5)]`
`therefore" cofactor of" " "a_(23) =-D`
where `D=|(3,1),(1,-3)|`
[after crossing the 2nd row and 3rd column]
`=-9-1=-10`
Hence, cofactor of `a_(23)=-(-10)=10`
Promotional Banner

Similar Questions

Explore conceptually related problems

Find adjoint of each of the matrices [{:(3,-2,3),(2,1,-1),(4,-3,2):}]

Compute the indicated products : (1) [{:(3,-1,4),(2,3,1):}][{:(1,3,4),(2,1,0),(-3,2,3):}] (2) [{:(1,3),(2,1):}][{:(4),(-1):}] (3) [{:(1,4,2),(5,-2,3):}][{:(2,-4),(1,-3),(4,0):}] (4) [1" "2," "3][{:(2),(4),(6):}] (5) [{:(2),(4),(6):}][1" "2," "3]

Find adjoint of each of the matrices [{:(2,-1,3),(4,2,5),(0,4,1):}]

The mid points of the sides of a triangles are (1,5,-1),(0,4,-2) and (2,3,4). Find its vertices.

Find the area of the triangle whose vertices are : (1) (2,3), (-1, 0), (2,-4) (2) (-5, -1),(3,-5), (5,2)

Following points lies in which octants ? (-2,1,3),(-3,-4,0),(1,-2,3)