If the roots of are plotted in the Argand plane, they are 

a) 
On a parabola 
b) 
Concyclic 
c) 
Collinear 
d) 
The vertices of a triangle 
If the roots of are plotted in the Argand plane, they are 

a) 
On a parabola 
b) 
Concyclic 
c) 
Collinear 
d) 
The vertices of a triangle 