8-3x=17 what does x equal

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

Someone me i need with this stuff