S1 = 1 - 7 = -6 = aS1 = 1 - 7
S2 = 4 - 14 = -10
U2 = S2 - S1 = -4
beda = 2
Rumus suku ke n adalah Un = -6 + (n-1)2 = 2n - 8
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S1 = 1 - 7 = -6 = aS1 = 1 - 7
S2 = 4 - 14 = -10
U2 = S2 - S1 = -4
beda = 2
Rumus suku ke n adalah Un = -6 + (n-1)2 = 2n - 8