Thursday

December 18, 2014

December 18, 2014

Posted by **Lucy** on Sunday, October 12, 2008 at 5:05pm.

I have the focal constant = 2a which means that a=3 but don't know how to proceed.

Thanks.

- Pre-Calculus -
**Damon**, Sunday, October 12, 2008 at 5:31pmWell you know the center is halfway between the foci, at (3,-2)

I agree that a = 3

The form is:

(y+2)^2/a^2 + (x-3)^2/b^2 = 1

we need b

the distance from center to focus is sqrt(a^2-b^2)

so

11 = 3^2+b^2

b^2 = 2

b = sqrt 2

so

(y+2)^2/9 + (x-3)^2/2 = 1

**Answer this Question**

**Related Questions**

math help - 1.Find the volume of a cube whose sides each measure 3.9. Round ...

math - Find an equation for the ellipse that satisfies the given conditions. ...

Pre Calculus - find an equation in standard form for the ellipse if the major ...

math - . Find the volume of the sphere with a radius of 9. Use ð = 3.14 and ...

PreCalc - Find the standard form of the equation of the ellipse with the ...

pre cal - What is the center of the conic whose equation is x^2 + 2y^2 - 6x + ...

pre-cal - a rectangular board is 2 by 12 units. How far from the short sides of ...

Ms Sue Please Help ! Analytic Geometry - Find the vertices, foci, eccentricity...

Algebra - 1. What is the equation an ellipse with foci at (0, ±2 √10 ) and...

science - the separation of the foci of an ellipse that describes a planet's ...