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Verified answer
A = 127b = 119 - 127 = -8
Un = a + (n - 1)b
Un = 127 + (n - 1)(-8)
Un = 127 + (-8n) + 8
Un = 135 - 8n
Verified answer
Materi : Barisan dan DeretKelas : IX SMP
Barisan :
127 , 119 , 111 , 103 , 95 ,... , ...
U₁ = 127
b = U₂ - U₁ = 119 - 127 = -8
Un = U₁ + (n - 1) b
Un = 127 + (n - 1)(-8)
Un = 127 - 8n + 8
Un = -8n + 135