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b. -4 = -2, -6, -10
a = 1
b = 6 - 1 = 5
Un = a + (n - 1)b
= 1 + 5(n - 1)
= 5n - 4
U₄ = 5(4) - 4 = 16
U₅ = 5(5) - 4 = 21
U₆ = 5(6) - 4 = 26
b) 10, 6, 2, ...
a = 10
b = 6 - 10 = - 4
Un = a + (n - 1)b
= 10 - 4(n - 1)
= - 4n + 14
U₄ = - 4(4) + 14 = - 2
U₅ = - 4(5) + 14 = - 6
U₆ = - 4(6) + 14 = - 10