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bilangan I = a
bilangan II = b
a + b = 30
b = 30 - a
a × b = 216
a (30 - a) = 216
30a - a² = 216
-a² + 30a - 216 = 0
a² - 30a + 216 = 0
(a - 18) (a - 12) = 0
a - 18 = 0
a = 18
atau
a - 12 = 0
a = 12
a = 18
b = 30 - a = 30 - 18 = 12
selisih = a - b
= 18 - 12
= 6