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a = -8, b = 3
Un = a+(n-1)b
Un = -8+(n-1)3
Un = -8+3n-3
Un = 3n-11
b.
a = 5, b = -2
Un = a+(n-1)b
Un = 5+(n-1)(-2)
Un = 5-2n+2
Un = 7-2n
c.
a = 7, b = 2
Un = a+(n-1)b
Un = 7+(n-1)2
Un = 7+2n-2
Un = 2n+5
d.
a = 1/4
r = -2
=-8+(n-1)3
=-8+3n-3
=3n-11
b) a=5 ,b=-2 ,Un=a+(n-1)b
=5+(n-1)-2
=5+2n+2
=2n+7