Question

What are the foci of the ellipse? Graph the ellipse.
18x^2+36y^2=648

Answer 1

start by putting the ellipse in standard form

(divide 648 both sides)

Answer 2

ohhhhh... ok, I was wondering what to do. XD

Answer 3

\[\frac{ x^2 }{ 36 }+\frac{ y^2 }{ 18 }\]

Answer 4

right?

Answer 5

and it'll equal one... I forgot to put that in

Answer 6

Yep! so the ellipse is clearly horizontal.

Answer 7

how can you tell if it's horizontal?