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Kelas 10 Matematika
Bab Persamaan Kuadrat

2x² + px + (p - 1) = 0
a = 2; b = p; c = p - 1

(x1)² + (x2)² = 4
(x1 + x2)² - 2 . x1 . x2 = 4
(-b/a)² - 2 . c/a = 4
(-p/2)² - 2 . (p - 1)/2 = 4
p²/4 - p + 1 - 4 = 0


** dikali 4 **

p² - 4p - 12 = 0
(p - 6) (p + 2) = 0
p - 6 = 0
p = 6

p + 2 = 0
p = -2

Maka, p = -2 atau p = 6