Question

Akar-akar persamaan kuadrat 2x² - 5x + 7 = 0 adalah x1 dam x2 . Hasil dari 2x¹ + 2x² - 4x¹x² = ....


Tolong dibantu

Answer 1

Verified answer

2x² - 5x + 7 = 0
a = 2
b = -5
c = 7

x1 + x2 = -b/a = 5/2
x1 x2 = c/a = 7/2

2x1 + 2x2 - 4x1x2
= 2(x1 + x2) - 4x1x2
= 2 . 5/2 - 4 . 7/2
= 5 - 14
= -9