# Ejercicio 02.18

## a)

P:3*x^3+x^2+12*x+4$

allroots(P);

## b)

kill(all)$

P:(1/3)*x^3+2*x^2+(2/3)*x-7$

allroots(P);

## c)

kill(all)$

P:x^4+2*x^3-9*x^2-18*x$

allroots(P);

## d)

kill(all)$

P:x^5-25*x^3+85*x^2-106*x+45$

allroots(P);