Diketahui Barisan Aritmatika :
U3= -11
U8= -1
Tentukan nilai a, b, dan U18
Tolong ya![]()
U3= -11
U8= -1
Tentukan nilai a, b, dan U18
Tolong ya
Jawab:
a = -15
b = 2
U18 = 19
Penjelasan dengan langkah-langkah:
B = U8 - U3/-1 - -11
= -1 - -11/ 8 - 3
= 10/5 = 2
B = 2
Un = a + (n - 1)b = -11
U3 = a + (3 - 1)2 = -11
U3 = a + 2(2) = -11
-11 = a + 4
a = 4 - 11
a = -15
U18 = a + (n - 1)b
U18 = -15 + (18 - 1)2
U18 = -15 + 17 x 2
U18 = -15 + 34
U18 = 19
stay health and eagern to learn
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