Question 1100420
Calculate the foci using the semi-major and semi-minor lengths.
{{{c^2=b^2-a^2}}}
{{{c^2=36-9}}}
{{{c^2=27}}}
{{{c=3sqrt(3)}}}
Starting at the center ({{{-2}}},{{{4}}}), add/subtract to the y-coordinate,
({{{-2}}},{{{4+3sqrt(3)}}}) and ({{{-2}}},{{{4-3sqrt(3)}}})
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*[illustration vc4.JPG].