If the equation `ax^2+x+b=0` and `x^2+bx+a=0` a have common root and the second Equation has equal roots, then `2a^2+b`:

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) + bx - a = 0 have a common root, then

If the equations 2x^(2)-7x+1=0 and ax^(2)+bx+2=0 have a common root, then

If the equations 2x^(2)7x+1=0 and ax^(2)+bx+2=0 have a common root,then

If the two equation x^(2)-cx+d=0 and x^(2)-ax+b=0 have one common root and the second has equal roots then 2(b + d) is equal to

If the two equations x^(2)-cx+d=0 and x^(2)-ax+b=0 have one common root and the second has equal roots,then 2(b+d)=(A)0(B)a+c(C)ac(D)-ac