(2x-1)^2 +5(2x-1)+6=0
(2x-1)²+5(2x-1)+6=0
4х² - 4х + 1 + 10х - 5 + 6 = 0
4х²+6х+2 = 0
2х²+3х + 1 = 0
(2х+1)(х+1) = 0
х₁ = -0,5
х₂ = -1
(2x - 1)² + 5(2x - 1) + 6 = 0
Сделаем замену :
2x - 1 = m
m² + 5m + 6 = 0
D = 5² - 4 * 6 = 25 - 24 = 1
1) 2x - 1 = - 3
2x = - 2
x₁ = - 1
2) 2x - 1 = - 2
2x = - 1
x₂ = - 0,5
Ответ : - 0,5 ; - 1