Answer
$x^2+20x+y^2-10y-775=0$
Work Step by Step
Center=$(-10,5)$ Radius=$30$
Equation:
$(x+10)^2+(y-5)^2=30^2$
$\implies x^2+20x+100+y^2-10y+25=900$
$\implies x^2+20x+y^2-10y-775=0$
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