# How do you find the center, foci and vertices of #9x^2+4y^2+36x-24y+36=0#?

##### 2 Answers

#### Explanation:

First off, group terms with the same variables together

Next, we "complete" the square.

Add a third term to each of the grouped terms such that it will be a perfect square trinomial.

However, note that the equality must be maintained. To do this, we need to either add the same value on the other side of the equation or subtract the same value on the same side of the equation.

Move the constant to the other side

We want the other side of the equation to be 1, so divide both sides of the equation by the moved constant

Now that we have transform the equation into the standard equation for ellipse, we can easily get the desired properties

Major axis is vertical

Rearrarange the equation thus:

#### Explanation:

Then re-arrange to standard form:

which is an ellipse centered at