Question

3 -2 0 how do i find adjoint of the matrix?
1 4 0
0 0 2

Answer 1

it is the matrix of determinants obtained by using 1 point.

point (1,1) = 3. eliminate the 1st row and 1st colum and take the determinant of what remains. determinant = 8. the (1,1) entry of the adjoint matrix is 8

point (2,3) = 0. eliminate 2nd row and 3rd column. take det of
3 -2
0 0

adjoint entry (2,3) = 0

hope this makes sense. if not: http://www.mathwords.com/a/adjoint.htm

Answer 2

kind of thank you for the input.

Answer 3

Matrix of minors to cofactors then transpose to adjoint.... if you can remember that Adjoint is the Transpose of Cofactor, you can usually find it. But a lot of classes do not stress it much, relying on the \(\mathrm{[A|I]}\rightarrow\mathrm{[I|A^{-1}]}\) method.

Answer 4

thank you

Answer 5

np. Have fun!