Question

-
1) 19 -(3x2 - 2x) - (6x - x2)= 7-2х2.

Answer 1

x = 5

x = 5

x = 5

x = 5

Answer 2

19 - (3х² - 2х) - (6х - х²) = 7 - 2х²

19 - 3х² + 2х - 6х + х² = 7 - 2х²

2х² + х² - 3х² - 4х = 7 - 19

-4х = -12

х = -12 : (-4)

х = 3

Ответ: 3.