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atau
a = 17 dan b =13
Penjelasan:
a + b = 30
a = 30 - b
a. b = 221
(30 - b) b = 221
30b - b² = 221
b² - 30b + 221 = 0
(b - 13) (b - 17)
b = 13 dan 17
a = 30 - b
= 30 - 13 = 17
a = 30 - 17 = 13