For any graphable equation, the software first manipulates it into its standard form before graphing; for a linear equation, that form is "y=mx+b" where the slope "m" may then be determined by inspecting the equation (for example, in the equation "y=-2x+4" "-2" is the correct value for "m"). For a parabolic equation, the standard form is y = a(x - h)^2 + k, from which direction (polarity of "a") and axis of symmetry (value of "h"), etc. may be determined by inspection.

Your equation is manipulated into the standard form and the steps are clearly shown [note that the steps appear below the graph].  It is typically better to use the 'Options' tab then begin a solution with 'a few steps' and then increase the number of steps as the additional information is helpful.