We need to know this:
If Δ > 0 we have two and different solutions
If Δ = 0 we just one solution
If Δ < 0 we don't have real solutions
bearing in mind that the x-intercept occurs when y = 0, Check the picture below.
I dont know what you mean by solve but make an X Y table and plug your values in. Try X=1 X=2 X=3 and so on. also do negatives so you can see the lower quadrants.