Answer
Centre = (-5, 0)
Radius = 5
Work Step by Step
$x^{2}$ + 10x + $y^{2}$ = 0
$(x+5)^{2}$ - 25 + $y^{2}$ = 0
$(x+5)^{2}$ + $y^{2}$ = 25
$(x+5)^{2}$ + $y^{2}$ = $5^{2}$
Centre = (-5, 0)
Radius = 5
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