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x² - 10x = 3
x² - 10x + 25 = 3 + 25
x² - 10x + 25 = 28
(x - 5)² = 28
x - 5 = √28
x - 5 = √4 √7
x - 5 = ± 2√7
⇒
x - 5 = 2√7
x = 2√7 + 5
⇒
x - 5 = - 2√7
x = -2√7 + 5
Jawabannya C ya. Jadiin solusi terbaik jikalau membantu~ Terima Kasih...