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Un = a + ( n - 1)b
1. a = 3
b = 3
Un = 3 + (n-1)3
Un = 3 + 3n - 3
Un = 3n
2. a = 40
b = 5
Un = 40 + (n-1)5
Un = 40 + 5n - 5
Un = 5n + 35
3. a = 36
b = -9
Un = 36 + (n - 1)-9
Un = 36 - 9n + 9
Un = 45 - 9n