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Verified answer
Un=2n²-2U1=2(1)²-2=0
U2=2(2)²-2=6
b=6-0=6
Sn=(n/2)(2a+(n-1)b)
S4=2(0+18)
S4=36
Verified answer
Un = 2n^2 - 24 suku pertama maka cari U1, U2, U3, U4
U1 = 2 x 1^2 - 2 = 2 x 1 - 2 = 0
U2 = 2 x 2^2 - 2 = 2 x 4 - 2 = 6
U3 = 2 x 3^2 - 2 = 2 x 9 - 2 = 16
U4 = 2 x 4^2 - 2 = 2 x 16 - 2 = 30
Correct me if I'm wrong, thank you! :)