Equation of Normal for General Equation of a Circle

Q.

Middle point of the chord of the circle $x^2+y^2=25$ intercepted on the line $x-2y=2$ is

1. 

2. 

3. 

4. 

Q. If x + y + k = 0 is a tangent to the circle $x^2+y^2$ - 2x - 4y + 3 = 0 then k =

1. $\pm$ 20
2. –1, – 5
3. $\pm$ 2
4. 4