The equation of the circle described on the common chord of the circles `x^2 +y^2- 4x -5=0 and x^2 + y^2 + 8y + 7 = 0` as a diameter, is

The equation of the circle described on the common chord of the circles x^(2)+y^(2)+2x=0 and x^(2)+y^(2)+2y=0 as diameter, is

Equation of the circle on the common chord of the circles x ^(2) + y ^(2) -ax =0 and x ^(2) + y ^(2) - ay =0 as a diameter is

The equation of the circle on the common chord of the circles (x-a)^(2)+y^(2)=a^(2) and x^(2)+(y+b)^(2)=b^(2) as diameter, is

Find the equation of the circle whose diameter is the common chord of the circles x^(2) + y^(2) + 2x + 3y + 1 = 0 and x^(2) + y^(2) + 4x + 3y + 2 = 0

Two circles x^(2) + y^(2) - 2x - 4y = 0 and x^(2) + y^(2) - 8y - 4 = 0

The lenght of the common chord of circles x^(2)+y^(2)-6x-16=0 and x^(2)+y^(2)-8y-9=0 is