Write the equation of the unit circle concentric with `x^2+y^2-8x+4y-8=0.`

Equation of unit circle concentric with circle x^(2)+y^(2)+8x+4y-8=0 is

Find the equation. of the circle concentric with the x^2 +y^2 + 4x-8y-6=0 and having radius double of its radius.

Find the equation.of the circle concentric with the x^(2)+y^(2)+4x-8y-6=0 and having radius double of its radius.

Find the equation of the circle concentric with the circle x ^2 + y ^2 - 8x + 12y + 15 = 0 and passing through the point (5, 4).

Find the equation of the circle concentric with the circle x^(2) + y^(2) - 8x + 6y -5 = 0 and passing through the point (-2, -7).

Find the equation of the circle concentric with the circle x^(2) + y^(2) - 8x + 6y -5 = 0 and passing through the point (-2, -7).

Find the equation of the circle concentric with the circle x^(2)+y^(2)-8x+6y-5=0 and passing through the point (-2,-7),

Find the equation of the circle concentric with the circle x^(2) + y^(2) - 8x + 6y -5 = 0 and passing through the point (-2, -7).