Is there any way to insert graph in comments?
Unfortunately, you cannot use Socratic's graphing utility to add graphs in the comments sections.
However, you have a few options that you can use to get around this issue. For example, you can use a third-party graphing utility to graph your function and copy the link to the graph in the comment.
Alternatively, you can take a screenshot of the graph, upload it to a free image hosting website, then share the link to the screenshot in the comment.
You can also use a scratchpad to create the graph, then share the link to the scratchpad in the comment--remember to make the scratchpad public, otherwise other contributors won't be able to open it.