Hanya No 2Jawaban TerbaikMatematika WajibKelas XI

U1 = a = -2
U7 = a + 6b
~substitusi
U7 = -2 + 6b = 16
6b = 18
b =3

S10 = 10/2 (2.-2 + 9.3)
S10 = 5 ( -4 + 27)
S10 = 5. 23 = 115