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=> (x1 + x2)/(x1.x2)
x² - 4x - 3 = 0
a = 1
b = -4
c = -3
→ (x1 + x2)/(x1.x2)
→ (-b/a)/(c/a)
→ (4/1)/(-3/1)
→ 4/-3
→ -1 ⅓