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b.2x² - 5x=0 ⇔x(2x - 5) = 0 ⇔ x = 0 atau 2x = 5 ⇔ x = 5/2
c.9-x² = 0 ⇔ (3-x)(3+x) = 0 ⇔ x = 3 atau x = -3