Question

Rezolvă in Z ecuatiile si inecuatiile urmatoare
A) |x-2|=5
B) |x-5| <4
C) x × x < 25
D) (x-3)(2y+1)=10

Answer 1

a)

|x-2|=5

x-2=5

-(x-2)=5

x=5+2=7

-x+2=5

2-x=5

-x=5-2=3

x=-3

S={7,-3}

b)

|x-5|<4

-4<x-5<4

-4+5<x<4+5

1<x<9