A. (-5, -9)

B. (-9, -15)

C. (-5/2, -9/2)

D. none

If x^{2}+y^{2}+6x+2ky+25=0 touches the y-axis then k=

Equation of the circle passing through (2, 0) and whose radical axis w. r. to the circle x^{2}+y^{2}=1 is at x=1/2 is

If the tangent from a point P to the circle x^{2}+y^{2}=1 is perpendicular to the tangent from P to the circle x^{2}+y^{2}=3, then the locus of P is

The locus of the poles of the line 2x-3y-4=0 w.r.t the circle x^{2}+y^{2}+2λx-16=0 is

Let AB be the chord 4x-3y +5 = 0 with respect to the circle x^{2}+y^{2}-2x+4y-20=0. If C= (7, 1), then the area of the triangle ABC is