If the equations x2 + 2x + 3 = 0 and ax2 + bx + c = 0, a, b, c R, have a common root, then a : b : c is : (1) 1 : 2 : 3 (2) 3 : 2 : 1 (3) 1 : 3 : 2 (4) 3 : 1 : 2 Share with your friends Share 1 Neha Sethi answered this Dear student We have,x2+2x+3=0D=b2-4acHere,a=1, b=2,and c=3So, D=22-413=8-12=-4<0So, Both roots are imaginarySince a,b,c∈RIf one root is common then both roots are common.Hence, a1=b2=c3So, a:b:c=1:2:3 Regards 0 View Full Answer