Question 889314
A circle centered at ({{{0}}},{{{-4}}}) with radius {{{5}}} would be,
{{{(x-0)^2+(y+4)^2=25}}}
{{{x^2+y^2+4y+16=25}}}
{{{highlight(x^2+y^2+4y-9=0)}}}
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{{{a=0}}}
{{{b=4}}}
{{{c=-9}}}