bener gk tu jawabannya?

P^-1 = 1/(3×2 - 1×4) 2....-1
..................................-4.....3
P^-1 = 1/(6-4)........2....-1
..............................-4.....3
P^-1 = 1/2 ......2...-1
.......................-4...3
P^-1 = 1.....-1/2
...........-2.....3/2

QP^-1
= 1.....0........1.....-1/2
...-2...3.......-2....3/2
= 1×1 + 0×(-2).....1×(-1/2) + 0×(3/2)
..-2×1 + 3×(-2)...-2×(-1/2) + 3×(3/2)
= 1 + 0.....-1/2 + 0
..-2 - 6........1 + 9/2
= 1.....-1/2
..-8.....11/2

maka det. (QP^-1) = |QP^-1|
= 1 × 11/2 - (-1/2×(-8))
= 11/2 - 4
= 11/2 - 8/2
= 3/2 (A)