First you gotta do rise over run. then once you do that, you should get your answer. which is x=-4
The question is asking to state on how to use the distributive property to check the binomial factor when a trinomial has been factored. In my calculation and further research, I would say that the answer would be that you have to split one of the binomial and then apply the distributive property.
If the line is curving up or curving down.