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(x + 5)(x - 2)
x + 5 = 0 atau x - 2 = 0
x = -5 x = 2
Kita anggap yang (p = -5) dan (q = 2)
p²
(-5)²
(-5)(-5)
25
q²
(2)²
(2)(2)
4
⇒ x² + 5x - 2x - 10 = 0
⇒ x(x + 5) - 2(x + 5) = 0
⇒ (x + 5) (x - 2) = 0
⇒ x + 5 = 0 dan x - 2 = 0 , maka :
⇒⇒ x = -5 (p) ===> p² = 25
⇒⇒ x = 2 (q) ===> q² = 4
persamaan kuadrat baru :
x² - (pemjumlahan akar)x + (perkalian akar) = 0
x² - (25 + 4)x + (25 . 4)= 0
x² - 29x + 100 = 0