a = 5
b = U2 - U1 = -2 - 5 = -7
Un = a + (n - 1)b
Un = 5 + (n - 1)(-7)
Un = 5 + (-7n + 7)
Un = 12 - 7n
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a = 5
b = U2 - U1 = -2 - 5 = -7
Un = a + (n - 1)b
Un = 5 + (n - 1)(-7)
Un = 5 + (-7n + 7)
Un = 12 - 7n