Question

решите уравнение (2х +7)(х-1)=0

Answer 1

$(2x + 7)(x - 1) = 0 \\ 1)2x + 7 = 0 \\ 2 x = - 7 \\ x = - 3.5 \\ 2)x - 1 = 0 \\ x = 1$

Answer 2

(2х +7)(х-1)=0
2х^2 - 2х + 7х - 7 = 0
2х^2 + 5х - 7 = 0
а = 2 b = 5 с= -7
Д = b ^2 - 4ас = 25 - 4 • 2 • (- 7) = 25 + 56 = 81 > 0. 9.
х1 = -b + √Д/2а = -5 + 9 / 4 = 4/4 = 1.
х2 = -b - √Д/2а = -5 - 9/ 4 = - 14/4 = -3,5.
Ответ: -3,5 ; 1.
Удачи)))