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x²-3x+2 = (x-2)(x-1)
untuk x=2
2(2)³-5(2)²+P(2)+Q = 3(2) - 1
2(8) - 5(4) + 2P + Q = 6-1
16 - 20 + 2P + Q = 5
2P + Q = 5 - 16 + 20
2P + Q = 9
untuk x = 1
2(1)³-5(1)²+P(1)+Q = 3(1)-1
2 - 5 + P + Q = 3-1
P + Q = 2 - 2 + 5
P + Q = 5
gunakan metode eliminasi
2P + Q = 9
P + Q = 5
________-
P = 4
gunakan metode subtitusi
P + Q = 5
4 + Q = 5
Q = 5 - 4
Q = 1
jadi
2P + Q = 2(4) + 1 = 8+1 = 9
jawabannya 9.
semoga berguna ^_^
tanya aja kalo gak paham y