I see it like this
I thought of that, too, that the constant can always push the equation positive. Where I am confused is that when I run this problem through Wolfram (or my calculator) to check my work, it shows the answer as . I'm just trying to understand whether I am getting the right answer or not, and I have two sources (that I trust more than my own work) that have a slightly different answer.
Any thoughts? Thanks again.