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Find the equation of the circle with cen...

Find the equation of the circle with centre : `(-a , b)`and radius `sqrt(a^2-b^2)`.

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Centre `-=` (-1,-b) and radius `=sqrt(a^(2)-b^(2))` unit.
`:.` Equation of circle, `(x-h)^(2)+(y-k)^(2)=r^(2)`
`rArr" "(x+a)^(2)+(y+b)^(2)=(sqrt(a^(2)-b^(2)))^(2)`
`rArr" "x^(2)+2ax+a^(2)+y^(2)+2by+b^(2)=a^(2)-b^(2)`
`rArr" "x^(2)+y^(2)+2ax+2by+2b^(2)=0`
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