Question

Решите уравнение |2х + 7| = 3 .

Answer 1

$\left[\begin{array}{ccc}2x+7=3\\-(2x+7)=3\\\end{array}$
$\left[\begin{array}{ccc}2x=-4\\-2x=10\\\end{array}$

$\left[\begin{array}{ccc} x_{1} = -2\\ x_{2} =-5\\\end{array}$

Answer 2

|2x+7|=3
2x+7= 3   и   2х+7= –3
2х= 3 –7       2х= –3 –7
2х= –4          2х= –10
х= –4:2         х= –10:2
х= –2            х= –5

Ответ: х1= –2; х2= –5