Problema Solution
find the foci of the ellipse with the equation 18x^2+36y^2=648
then graph the ellipse
Answer provided by our tutors
18x^2+36y^2=648
18x^2/648 + 36y^2/648 = 1
x^2/36 + y^2/18 = 1
sqrt(36-18) = sqrt(18) = 3sqrt(2)
foci are (3sqrt(2),0) and (-3sqrt(2),0)