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:
U1 = a = -15
U5 = a + 4b = 1
Maka :
a)
U5 = a + 4b
1 = -15 + 4b
4b = 1 + 15
4b = 16
b = 16/4
b = 4
b)
U10 = a + 9b
U10 = -15 + 9(4)
U10 = -15 + 36
U10 = 21
c)
Dengan U1 = -15 dan beda = 4,
Maka 10 suku pertamanya yaitu :
-15, -11, -7, -3, 1, 5, 9, 13, 17, 21, . . . .