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Verified answer
DERET ARITMATIKAU8 = 13
U13 = 38
Ditanya U1 atau nilai a
Jawaban
➡Tentukan beda barisan
U13 - U8 = 38 - 13
13b - 8b = 25
5b = 25
b = 25/5
b = 5
Maka, nilai a barisan adalah :
U8 = 13
a + (8-1)b = 13
a = 13 - 7(5)
a = 13 - 35
a = -22
Jadi, suku pertama barisan = -22 ✔