Question

Решите уравнение: (х+4)(х-2)+(2-х)(2х-3)=0

Answer 1

x² + 4x - 2x - 8 + 4x - 2x² - 6 + 3x = 0
-x² + 9x - 14 = 0
x² - 9x + 14 = 0
D = 81 - 56 = 25
x1 = (9-5)/2 = 2
x2 = (9+5)/2 = 7