Jumlah n suku pertama deret aritmatika Sn = 5n kuadrat - 7n, maka rumus suku ke n adalah...?
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S(1) = -2, jadi U1 = a = -2
S(2) =
U1 + U2 = S2
-2 + U2 = 6
U2 = 8
Beda (b) = U2 - U1 = 10
Rumus suku ke-n = -2 + (n - 1)10
= 10n - 12