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Verified answer
U1= au2= a+b
u4= a+3b
6= a+b
14= a+3b
_________-
-8= -2b
b= 4
u2= a+b
6= a+4
6-4= a
2= a
un= a+(n-1)b
un= 2+(n-1)4
un= 4n-4+2
un= 4n-2
u8 = 4.8-2
u8= 32-2
u8= 30
U4=a+3b=14, eliminasi variabel a, dgn cara di -
Hasilnya - 2b=-8
b=8/2=4,
Subtitusi nilai bagus ke pers 1 atau 2
a+b=6
a=6-b
a=6-4=2
U8=a+7b
U8=2+7.4=30