> solve(x^2-1,x);

> solve(x^2+1.0,x);

> plot(x^2+1,x=-0.5..0.5);

> plot(x^2-1,x=-3..3);

>

> plot(x^3-1,x=-3..3);

> plot(x^3-1,x=-1..1);

> plot(x^3-1,x=-0.5..0.5);

>

> solve(x^3-1.0,x);

> solve(x^3+1.0,x);

>

> plot({x^3-1,x^3+1},x=-3..3);

> solve(x^4-1.0,x);

> plot(x^4-1,x=-2..2);

> solve(x^4+1.0,x);

> plot({x^4+1,x^4-1},x=-2..2);

>