Question

Решите уравнение ||х| - 9|=3

Answer 1

|х| - 9=3
|х| =12
х=12
х=-12

|х| - 9=-3
|х|=6
х=6
х=-6

проверка
||12| - 9|=3
12-9=3
3=3

||-12| - 9|=3
|12- 9|=3
3=3

||6| - 9|=3
|6 - 9|=3
|-3|=3
3=3

||-6| - 9|=3
|6 - 9|=3
|-3|=3
3=3