30. Adjoint dari matriks [} 5&-8 4&-6 ] adalah __ a. [} 5&-8 4&-6 ] b. [} -6&8 -4&5 ] c. [} -5&8 -4&-6 ] d. [} 6&-8 4&-5 ] e. [} -6&-8 4&-5 ]

B

Given matrix [5 -8 4 -6], the adjoint of a 2x2 matrix is found by swapping the two elements on the main diagonal (top left and bottom right) and changing the sign of the other two elements(bottom left and top right). Therefore, Applied to our matrix, we will swap 5 and -6 and change the sign of -8 and 4.So, the adjoint of [5,-8,4,-6] is [-6,8,-4,5]