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a + 11b = - 4
__________ _
- 8b = 16
b = - 2
a = 18
suku kedua: a + b = 18 + (-2) = 16
U4 = a + (4-1) x b = 12
U4 = a + 3b = 12
Un = a + (n-1) x b
U12 = a + (12-1) x b = -4
U12 = a + 11b = -4
U4 = a + 3b = 12
U12= a + 11b = --4
__________________-
-8b = 16
b = -2
a + 3b = 12
a + (3 x -2) = 12
a + (-6) = 12
a = 18
Un = a + (n-1) x b
U2 = 18 + (2-1) x -2
U2 = 18 + 1 x -2
U2 = 18 + -2
U2 = 16