Question

Pd barisan geometri diketahui Un adlh suku ke n, U3=11 ,U8=352 maka U7=....

Answer 1

Ar^2 = 11
ar^7 = 352

ar^7/ar^2 = r^5 = 352/11
r^5 = 32
r= 2
ar^2 =   a x 2^2 = 11
a = 11/4
u7= ar^6 =  11/4 x 2^6 = 176

Answer 2

U3 = a.r² = 11
U8 = a.r^7
352 = ar² x r^5
352 = 11.r^5
r^5 = 352/11
r^5 = 32
   r = 2
ar² 11
a(2)² = 11
 4a = 11
   a = 11/4
U7 = ar^6
     = (11/4) )(2^6)
     = (11/4)(64)
     = (11).(16)
     = 176
     .