There is no "therefore" here. Yes, but that is not true because y'= 2x-1. If you want to say those are the critical numbers, say that.[tex]B)
Again, you don't say what this is supposed to answer. If you mean that (1/2, -2.25) is the only critical point say so.
Well, strictly speaking the graph of opens upward, but that's fairly common "abuse of notation".C)
D opens up.
And, specifically, is the vertex of the parabola.I don't know how to graph on latex but i would put a points at and draw an upward opening parabola.
Am i using them correctly? Any suggestions on better usage?