U5=11→11 = a1+b(5-1)→ a1+4b = 11
U8= 20→20 = a1+b(20-1)→a1+19b = 8
a1+4b = 11
a1+19b=8
--------------------- --
-15 = 3
b = -5 → a1+4.b =11
a1+2.(-5) = 8
a1. = 8-10
a1 = -2 (suku pertama)
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U5=11→11 = a1+b(5-1)→ a1+4b = 11
U8= 20→20 = a1+b(20-1)→a1+19b = 8
a1+4b = 11
a1+19b=8
--------------------- --
-15 = 3
b = -5 → a1+4.b =11
a1+2.(-5) = 8
a1. = 8-10
a1 = -2 (suku pertama)