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Verified answer
Mapel : MatematikaBab : Barisan dan Deret
Barisan Aritmatika
Un = bn + a - b
U5 = 5b + a - b
43 = 4b + a
Un = bn + a - b
U11 = 11b + a - b
91 = 10b + a
43 = 4b + a
91 = 10b + a
---------------- -
-48 = -6b
b = -48/-6
b = 8
43 = 4b + a
43 = 4(8)+ a
43 = 32 + a
a = 43 - 32
a = 11
Un = bn + a - b
U45 = 8(45) + 11 - 8
U45 = 360 + 3
U45 = 363