Question

Plis nomor sembilan !!!

Answer 1

Semoga membantuuu yahhhhh

Answer 2

Sn = 4/3n^2 + 2/3n
S1 = 4/3(1^2) + 2/3(1)
= 4/3 + 2/3
= 6/3
= 2 = U1
S2 = 4/3(2^2) + 2/3(2)
= 4/3(4) + 4/3
= 16/3 + 4/3
= 20/3
S2 = U1 + U2
16/3 = 2 + U2
U2 = 20/3 - 2
= 20/3 - 6/3
= 14/3
b = U2-U1
= 14/3 - 2
= 14/3 - 6/3
= 8/3