If the circles x^(2) +y^(2) + ax -6y + ...

If the circles `x^(2) +y^(2) + ax -6y + 4 =0 and x^(2) + y^(2) - 12x + 32 =0`
touch externally each other and if the distance between the centres is
equal to 5, then the values of a are

A

`2,3`

B

`-2, -3`

C

`-4, -20`

D

`-7, -6`

Verified by Experts

The correct Answer is:

C

Similar Questions

Explore conceptually related problems

The circles x^(2)+y^(2)-4x-6y-12=0 and x^(2)+y^(2)+4x+6y+4=0

If the circles x ^(2) + y ^(2) - 8x - 6y + c= 0 and x ^(2) + y ^(2) - 2y + d =0 cut orthogonally, then c + d equals

The value of k, if the circles 2x ^(2) + 2y ^(2) - 4x + 6y = 3 and x ^(2) + y ^(2) + kx + y =0 cut orthogonally is

If the two circles (x+7)^(2) + (y-3)^(2) = 36 and (x-5)^(2) + (y+2)^(2) = 49 touch each other externally, then the point of contact is