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Un = 10 + (n-1)(4)
Un = 10 + 4n - 4
Un = 10-4 + 4n
Un = 4n + 6
b = U2 - U1 = 14 - 10 = 4
Un = a + (n-1) b
= 10 + (n-1) 4
= 10 + 4n - 4
= 6 + 4n
b) a = 16
b = U2 -U1 = 21 - 16 = 5
Un = a +(n-1) b
= 16 + (n-1) 5
= 16 + 5n - 5
= 11 + 5n