What two numbers multiply to 18 but add to get -5?

So this one has to be two negative numbers to get a positive number. so then you can think of what multipys to 18
-9*-2 wont work because -9+-2 gets you -11
-6*-3 wont work because -6+-3 gets negative nine
i dont think there is one honestly. ive sat here and tried them all
2 and 9 6 and 3 and 18 and 1 

What are the options