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U3 = 9 = a + 2b
a + 2b = 9
25 + 2.b = 9
25 + 2b = 9
2b = 9 - 25
2b = - 16
b = - 16/2
b = - 8
Un = a + ( n-1 ) × b
Un = 25 + ( n-1 ) × -8
Un = 25 - 8n + 8
Un = 33 - 8n
Mian kalau salah ya ! ^^