Question

3. Dacă x € Z şi |2x +3|= 7, atunci x este:
A. x= {-5,-2}
B. x = (-2,5)
C. x =(-5, 2}
D. x={2,5)
dau coroana repede va rog​

Answer 1

Răspuns:

| 2x + 3 | = 7

2x + 3 = 7=> 2x = 7-3 => 2x = 4 => x = 2 .

2x + 3 = -7 => 2x = -7 -3 => 2x = - 10 => x = -5 .

Răspuns : X = ( - 5, 2 }