Question

PERTANYAAN 1 Dik : u7 =41 , u15= 89 Dit : a, b, Un, U35 PERTANYAAN 2 dik: Sn = 8Nkuadrat + 7N -5 dit: Un dan a Tolong dibantu ya, makasih.

Answer 1

U15 = u7 + 8b =89 = 41 + 8b =8b = 48 =b = 6 u7 = a+6b =41 = a+36 =a = 5 u35 = 5+34x6 =209

Answer 2

1. u7 =41 , u15= 89 Dit : a, b, Un

b = 

U7 = a + (7-1)6
41 = a + (6)6
 a  = 41 - 36 = 5

Un = U15-U7 = U8

U35 = 5 + (35-1)6
       =  5 + 204
       = 209