What are the foci of the ellipse? Graph the ellipse.

18x2 + 36y2 = 648

1 answer

the standard form of the equation is
x^2/36 + y^2/18 = 1
since a^2 = 36 and b^2 = 18 we have the foci at (±c,0)
where c^2 = a^2 - b^2 = 18
So the foci are at (±√18,0)
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