What are the foci of the ellipse given by the equation 100x^2 + 64y^2 = 64,000

(0, ±6)
(±6, 0)
(0, ±36)
(±36, 0)

So for my answer I keep getting (0,-18.97) and (0,18.97) but that isn't one of the answer choices??

Question

What are the foci of the ellipse given by the equation 100x^2 + 64y^2 = 64,000

(0, ±6)
(±6, 0)
(0, ±36)
(±36, 0)

So for my answer I keep getting (0,-18.97) and (0,18.97) but that isn't one of the answer choices??

anonymous · Answer

I divided both sides by 64000, then reduced and got |dw:1363045547638:dw|