Question 879299
Two obvious critical values for x are -3 and 5.  Check a value in each interval.


(-oo, -3), pick -4=x.
(-)(+)=(-)<0 TRUE.


(-3, 5), pick x=0.
(+)(+)=(+)<0, basically FALSE.


(5, oo), pick 10=x.
(+)(-)=(-)<0 TRUE.


Statement is true for x in (-oo, -3)  OR  (5, oo).