Imheretosavetheday,
Guest has no idea what you are on about. Maybe s/he did eventually work it out but you did not explain.
You have not even tried to teach guest a solitary thing!
Guest.
The graph is positive when the y value is positive, I mean the graph must be above the x axis.
You could change the wording to : "For what values of x will the function (graph) be positive."
YOU only refer to the x values.
so
since it is above the x axis (where y is positive) between -6 and -3 and then again for all values of x greater than +3
I can say
The graph is positve from (-6,-3) and (+3, +infinity)
You use ( or ) if the end point IS NOT included
and you use [ or ] if the end point IS included.