Tolong dong pake cara:)

Sn = 3n^2 – 5(n-1)

a = S1 = 3 – 5(1-1) => a = 3

S2 = 12 – 5(2-1) => 7

beda = 7 – 3 => 4

U10 = 3 + 9(4)
U10 = 39

suku 10 pertama

3, 7, 11, 15, 19, 23, 27, 31, 35, 39