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a= 10 b= 4 dan Un = 640
640= 10+(n-1)4
640=10+4n-4
640=6+4n
4n=640-6
4n=634
n= 158,5
= 56 + (n-1)-5 = -36
= -5n = - 36 - 56 -5
n = - 97/-5 = 19,4
b. Un = 10 + (n-1) 4 = 640
= 4n = 640 - 10 + 4
n = 634/4 = 158,5