I am in need of a little algebra help. I have received this problem from an online site, and I figured out what values I need to plot on the number line:
In the range of this number line, I know I need to plot -1,2, and 7, as they are the answer to this equation (I am correct, right?). But, I am not exactly sure how to plot those points… One of the two dots means that value is included, the other means that that value is not included, but I am not sure right now. The icon of the line is the button that fills the space between two points with a line. Does anybody have any idea?\
BTW: I got my answers by going through all the numbers shown on the number line, and entering them for $x$, and the numbers are the values from the number line that return a real number when submitted into $x$