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S1 = U1 = 1/2 ( 3 (1)² + 1) = 1/2 (4)= 2
S2 = U1 + U2 = 1/2 (3 (2)² + 2) = 1/2 (14) = 7
U1 + U2 = 7
2 + U2 = 7
U2 = 5
Maka beda deret aritmatika tersebut = U2 - U1 = 5 - 2 = 3
Jadikan jawaban terbaik yah^^ Semoga membantu
s2 = 1/2 (3.2^2 + 1) = 7
s2 = a + a+b =7
a= 2 berarti b =3