Question

Write the EQ of circle i find center and radius given
x² + y²-4x+12y =-4

Answer 1

Explanation:

Hey there!

Given;

`{x}^(2) + {y}^(2) - 4x + 12y = \: - 4`

Now, Try to make it a perfect square.

`{x}^(2) - 4x + {(2)}^(2) - ( { 2)}^(2) + {y}^(2) + 12y + ( {6)}^(2) - ( {6)}^(2) = - 4`

Make perfect square and shift -(2)^2 and -(6)^2 on right side.

`( {x - 2)}^(2) ( {y + 6)}^(2) = - 4 + 40`

`( {x - 2)}^(2) ( {y + 6)}^(2) = 36`

Comparing the equation with (x-h)^2(y-h)^2= r^2.

We get,

Centre (h,k)= (2,-6)

Radius (r) = 6

Hope it helps...

Answer 2

CENTER :(2,-6)

RADIUS: 6

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