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S1 = 5(1)² - 3.1
S1 = 5.1 - 3
S1 = 5-3
S1 = 2
S2 = U1 + U2 = a + a + b = 2a + b
S2 = 5(2)² - 3.2
S2 = 5.4 - 6
S2 = 20-6
S2 = 14
S3 = U1 + U2 + U3 = a + a + b + a + 2b = 3a + 3b
S3 = 5(3)²-3(3)
S3 = 5.9 - 9
S3 = 45 - 9
S3 = 36
dst...
maka
U1,U2,U3,...
2, (14-2), (36-14),...
2,12,22,....
cari beda
U2-U1 = U3 - U2
12-2 = 22-12
10 = 10
maka bedanya adalah 10(D)