Equation of Radical Axis

Q.

Find the equation of radical axis of two circle $x^2+y^2-4x-2y=4$ and $x^2+y^2-12x-8y=12.$

1. $4x+3y+4=0$

2. $4x-3y-4=0$

3. $4x-3y+4=0$

4. $3x+4y-4=0$

Q.

If (h, k) is a point from which the tangents to the three circles $x^2+y^2-4x+7=0$, $2x^2+2y^2-3x+5y+9=0$ and $x^2+y^2+y=0$ are equal in length. Find the value of h + k ___ .

Q.

Find the equation of radical axis of two circle $x^2+y^2-4x-2y=4$ and $x^2+y^2-12x-8y=12.$

1. $4x+3y+4=0$

2. $4x-3y-4=0$

3. $4x-3y+4=0$

4. $3x+4y-4=0$