Well, the cubic equation has 2 possible situations

- one real root and two complex roots, e.g. x^3+1=0

- three real roots

- all roots are different

e.g. x^3-4x^2-7x+10=0

- single solution, all roots are the same

e.g. x^3-3x^2+3x-1=0

- two distinctive solutions, one root is different and two roots are the same (the equation has two roots)

e.g. your equation has two roots, x1=-2 and x2=x3=2

Your calc has QR code button (shift + optn). If you have android powered phone or tablet with camera and available internet connection, you can see the graph of your equation.

You need only this app

https://play.google....fx.CasioEduPlus

**Edited by pan.gejt, 13 February 2017 - 11:07 AM.**