Question

Решите уравнение |2х + 4| = 7

Answer 1

|2х + 4| = 7
!x!  = x x>=0
      = - x x<0
 1. 2х + 4 = 7
 2x=3
 x=1.5
2. 2х + 4 = -7
 2x=-11
 x=-5.5