Question

raportul x+3/x+7 sa apartina N*

Answer 1

x+3/x+7 sa apartina N*
=> x+7 | x+3
     x+7 | x+7
_____________-
x+7 | -4
=> x+7 ∈ D-4={-4,-2,-1,1,2,4}
x+7=-4 => x=-11
x+7=-2 => x=-9
x+7=-1 => x=-8
x+7=1  => x=-6
x+7=2  => x=-5 
x+7=4  => x=-3
x+3/x+7 ∈ N* => x={-11,-9,-8}