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(x + 2)(x - 5) = 0
x + 2 = 0 atau x - 5 = 0
x + 2 = 0 x - 5 = 0
x1 = -2 x2 = 5
a = -2 b = 5
Persamaan kuadrat baru <=> x² - (3/a)x + 3/b = 0
x² - (3/a)x + 3/b = 0
x² + 3/2x + 3/5 = 0 (dikalikan 10)
10x² + 15x + 9 = 0
Semoga membantu, maaf kalau salah :)