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b = -8 - ( -4 ) = -4
Un = a + ( n - 1 ) b
= -8 + ( n - 1 ) -4
= -8 - 4n + 4
Un = - 4n - 4
b = 4
maka rumus suku ke-n (Un) adalah:
Un = a +(n-1)b
Un = -8+(n-1)4
Un = -8+4n-4
Un = -12+4n