One that can do x^2-5X+2=0 and find the x-intercepts. I am way too lazy to do the quadratic formula and do not have enough room on my paper.
hey, the probably best way to do deal with your problem is the Online Graphing Calculator at https://www.plotgraphs.com ... It has a nice graphical user interface and therefore can get you really fast to your plot I am using it a lot for my homework...