If the equation ax²+2bx+c=0 and ax²+2cx+b=0,a≠0,b≠c, have a common root, then their other roots are the roots of the quadratic equation
A. a²x(x+1)+4bc=0
B. a²x(x+1)+8bc=0
C. a²x(x+2)+8bc=0
D. a²x(1+2x)+8bc=0