Diketahui: barisan aritmatika suhu ke -5 adalah 5 dan suku ke - 10 adalah 15
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tlong bntu jwab yaa :)
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U5 = 5
U10 = 15
U18 = . . . ?
15 = a + 9b <-------------- U10
5 = a + 4b - <-------------- U5
10 = 5b
b = 2
U5 = a +4b
5 = a +4(2)
5 = a + 8
a = -3
Un = a + b(n-1)
U18 = -3 + 2(18-1)
U18 = -3 + 34
U18 = 31