k के किस मान के लिए दिए गए वृत्त `x^(2)+y^(2)-3x+ky-5=0` और ` 4x^(2)+4y^(2)-12x-y-9 =0` संकेन्द्रीय होंगे ?

The circle 4x^(2)+4y^(2)-12x-12y+9=0

The circle 4x^(2)+4y^(2)-12x-12y+9=0

If circles x^(2) + y^(2) - 3x + ky - 5 = 0 " and " 4x^(2) + 4y^(2) - 12x- y - 9 = 0 are concentric , then k =

If the two circle x^(2) + y^(2) - 3x + ky - 5 = 0 and 4x^(2) + 4y^(2) - 12x - y - 9 = 0 are concentric , then : k =

If x^(2) + y^(2) + z^(2) + 12x + 4y + 5=0 find x^(12) + y+ z^(30) = ?

The value of k for which the circles x^2 + y^2 - 3x + ky - 5 = 0 and 4x^2 + 4y^2 - 12x - y - 9 = 0 become concentric is:

Equation of radical axis of the circles x^(2) + y^(2) - 3x - 4y + 5 = 0 and 2x^(2) + 2y^(2) - 10x - 12y + 12 = 0 is

The point at which the circles x^(2)+y^(2)-4x-4y+7=0 and x^(2)+y^(2)-12x-10y+45=0 touch each other is