Question 388036
Complete the square in {{{x}}} and {{{y}}}.
{{{3x^2+3y^2+42x+42y+186=0}}}
{{{x^2+14x+y^2+14x+62=0}}}
{{{(x^2+14x+49)+(y^2+14y+49)+62=49+49}}}
{{{(x+7)^2+(y+7)^2=98-62}}}
{{{(x+7)^2+(y+7)^2=36}}}
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{{{R=sqrt(36)=highlight(6)}}}