Should all the real roots be plotted or listed?

No I just couldn't get the format on here sorry.

Thanks so much you have been a lot of help!!

I thought this forum was for help and I don't understand it. 

Thanks that helped so much! I got the graph to appear now.  How to I plot actual points on the graph?

It is not graphing should my fuction be set to 2d math?  I am new to this and confused.

How do I show all real roots?  What function do I type in?