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a+b = 12
ab = 35
a + b = 12 maka a = 12 - b
ab = 35
(12-b)b = 35
12b - b² - 35 = 0
b² - 12 b + 35 = 0
(b-7)(b-5) = 0
maka b-7 = 0 atau b-5 = 0
b = 7 b = 5
Anggaplah saja b = 7 jadi a = 12-b = 12-7 = 5
Jadi bilangan itu adalah 5 dan 7