Question

Tolong Bantu Ya,,,
Soalnya tentang Barisan dan deret aritmetika
1. a. u1= 2 b= 4 u8=.....
b. u1= - 6 b= 5 u7=.....

Answer 1

A. a+(n-1)b= 2+(8-1)4 = 30
B.             = -6+(7-1)5 = 24

Answer 2

Un=a+(n-1)b
=2+(8-1)4
=2+7x4
=2+28
=30
Un=a+(n-1)b
=-6+(7-1)5
=-6+6x5
=-6+30
=25