Question

2. Rezolvă ecuațiile:
a) |2x-5|= 9;
b) 11-|2x+7| = -6
Urgent
Dau coroana

Answer 1

Răspuns:

| 2x - 5 | = 9

1) 2x - 5 = 9 => 2x = 14 => x = 7

2) 2x - 5 = - 9 => 2x = - 4 => x = - 2

11 - | 2x + 7 | = - 6

- | 2x + 7 | = - 6 - 11

- | 2x + 7 | = - 17

| 2x + 7 | =  17

1) 2x + 7 = 17 => 2x = 10 => x = 5

2) 2x + 7 = - 17 => 2x = - 24 => x = - 12