2 20*x + 5*(x - 2)
20*x + 5*(x - 1*2)^2
2 20 + 5*x
20 + 5*x^2
1*(x + 2*I)*(x - 2*I)
(1*(x + 2*i))*(x - 2*i)
20.0*x + 20.0*(-1 + 0.5*x)^2
/ 2 \ 5*\(-2 + x) + 4*x/
5*((-2 + x)^2 + 4*x)