A. 4x+3y+14=0, 4x+3y+16=0

B. 4x-3y-24=0, 4x-3y+26=0

C. 4x+3y+14=0, 4x+3y+16=0

D. 4x-3y+34=0, 4x-3y+16=0

The equation of the chord of the circle x^{2}+y^{2}=25 with (1, -1) as the midpoint is

The equations to the direct common tangents to the circles x^{2}+y^{2}+22x-4y-100=0, x^{2}+y^{2}-22x+4y+100=0is

If the equation of the circle cutting the circle x^{2}+y^{2}+2x-4y+8=0 orthogonally and coaxal with the circles x^{2}+y^{2}+6x+4y-12=0, x^{2}+y^{2}-4x-6y-12=0 is x^{2}+y^{2}+2ax+2by+c=0 then the ascending order of a, b, c is

The equation of the circle with centre at (2,3) and touching x-axis is

The condition that the circles x^{2}+y^{2}+2ax+2by+c=0, x^{2}+y^{2}+2bx+2ay+c=0 to touch each other is