Question

Rezolvați în Z ecuațiile: a) |2x − 3| = 7
b) 3(x − 2) + 2(x + 1) = 16 − 5x

Answer 1

a) |2x-3|=7

1. 2x-3= -7

2x= -7+3

2x= -4

x= -4:2

x= -2

2. 2x-3=7

2x=7+3

2x=10

x=10:2

x=5

x∈{-2,5}

b) 3(x-2)+2(x+1)=16-5x

3x-6+2x+2=16-5x

5x-4=16-5x

5x+5x=16+4

10x=20

x=20:10

x=2