The equations `x^(2)+x+a=0andx^(2)+ax+1=0` have a common root-

If the equations x^(2)-px+q=0 and x^(2)-ax+b=0 have a common root and the second equation has equal roots then

If the equations x^(2)+ax+b=0 and x^(2)+a'x+b'=0 have a common root then this common root is equal to

If the equations x^(2)-x-p=0 and x^(2)+2px-12=0 have a common root,then that root is

If the equations ax^(2)+bx+C=0 and x^(2)+2x+4=0 have a common root then find a:b:c