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Verified answer
Kelas 10 MatematikaBab Persamaan Kuadrat
2x² - 4x - 3 = 0
a = 2; b = -4; c = -3
(x1)² + (x2)²
= (x1 + x2)² - 2 . x1 . x2
= (-b/a)² - 2 . c/a
= (-(-4/2))² - 2 . (-3)/2
= 4 + 3
= 7