Auto-plot x-int of Cubic Function

Hello all! I am curious if there exists out there a Desmos Calculator that graphs f(x)=ax^3+bx^2+cx+d (or at least a=1), and plots as individual points its roots. I am having trouble getting it to work myself with general “cubic formulas” and even a formula for depressed cubics. If you’d like a task, here is what I have so far.