# conic sections:ellipse

2 posts / 0 new
Dean Carl Manansala conic sections:ellipse

questions:find teh equation of the ellipse satisfying the following conditions
1. foci at (±2,0),one vertex at (3,0)

2. co-vertices (-4,3) and (-4,-5),eccentricity 3/5

fitzmerl duron For the first question:

This is how to get the equation of the ellipse, given those what you have given:

Visualizing the problem above: We see that $a^2 = b^2 + c^2$, then $(3)^2 = b^2 + (2)^2,$ then
$b = \sqrt{5}$

Since we know that the center is $C(x,y) = C(0,0),$ we can now get the equation of
the ellipse:

$$\frac{x^2}{a^2} +\frac{y^2}{b^2} = 1$$ $$\frac{x^2}{(3)^2} +\frac{y^2}{(\sqrt{5})^2} = 1$$ $$\frac{x^2}{9} +\frac{y^2}{5} = 1$$

We can now lable the ellipse that is described by the poster: Foe the second question......you can answer it easily....Cheers!

• Mathematics inside the configured delimiters is rendered by MathJax. The default math delimiters are $$...$$ and $...$ for displayed mathematics, and $...$ and $...$ for in-line mathematics.