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2x² - 18 = 0
2(x² - 9) = 0
x² - 9 = 0
(x+3)(x-3) = 0
x = -3 dan x = 3
b.
x² - 3x = 0
x(x - 3) = 0
x = 0 dan x = 3
c.
x² - 4x + 3 = 0
(x-1)(x-3) = 0
x = 1 dan x = 3