Question

Dik U5 = 14
U8 = 29
Dit :-a?
-b?
-10 sukupertama?

Answer 1

u5 = a + 4b = 14
u8 = a +7b = 29 
               -3b = -15
                b = 5
               beda = 5
a + 4b = 14
a + 4(5) = 14
a = 14 - 20
a = -6
jumlah 10suku pertama = s10
s10 = 10/2 x (-12 + 9(5))
        = 5 x (33) = 165



u10 = a + 9b
-6 + 9.5
u10 = 39

Answer 2

U8 = a + 7b = 29
u5 = a+ 4b = 14 
_______________-
            3b = 15
b= 5
a = -6

S10 = 1/2n(2a+(n-1)b)
5(-12+(10-1)5)
5(-12+45)
5.33
S10 =165

u10 = a + 9b
-6 + 9.5
u10 = 39