I picked an equation $0= x^3 +x^2 -2x -1$ I plotted it with geogebra, to see if it had more than $1$ real root. It definitely cuts the $x$-axis $3$ times.
But when I checked wolfram alpha, to see if its roots could be written exactly(I'm doing A-level maths at school, and I have some C3 coursework to do, and if the value of the root can be found by factorising or something I can't use that equation), it said all three roots were complex (here's a link)
I'm just really confused, I can see that it cuts the $x$-axis $3$ times, but it has imaginary parts in all of its roots.
(although it shows the roots can be written exactly, they're complex enough that I can use the equation)