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U8 = A + 7d = 30 P2
P1 - P2
- 4d = -12
d = 3, sub ke P1
U4 = a +3.3 =18
= a + 9 = 18
a = 18 - 9 = 9
U25 = 9 + (25-1) 3 = 9 + 24 . 3 = 9 + 72 = 81
U4 = 18 -> a+3b = 18 -
4b = 12
b = 12:4 = 3
a+3b = 18
a+3(3) = 18
a+9 = 18
a = 18 - 9
a = 9
Un = a+(n-1)b
U25 = 9+(25-1)3
= 9 + 72
U25 = 81