Question

...... Va rog........ ​

Answer 1

se pune conditia ca :

2x+1∈D5={-5.-1,1,5}

2x+1=-5 ⇒2x=-6 ⇒x=-3

2x+1=-1 ⇒2x=-2 ⇒x=-1

2x+1=1 ⇒2x=0 ⇒x=0

2x+1=5 ⇒2x=4 ⇒x=2

x={-3,-1,0,2}