Question

Determina elementele multimi B =(x eN /26/3x+1 eN)

Answer 1

26/3x+1
=>3x+1e{13;2;1;26}

I. 3x+1=13|-1
3x=12|÷3
x=4

II. 3x+1=2|-1
3x=1|÷3
x=0, (3). NU

III. 3x+1=26|-1
3x=25|÷3
x=8,(3) NU

IV. 3x+1=1|-1
3x=0|÷3
x=0

=>xe{4;0}
=>B={4;0}