Sunday
April 20, 2014

Homework Help: Math(Please check)

Posted by Abbey on Thursday, April 15, 2010 at 3:47pm.

I am trying to find the standard form of this equation for an ellipse.

9x^2 + 4y^2 - 36x + 8y + 31 = 0

First I grouped the x and y's together.

9x^2 - 36x + ? + 4y^2 + 8y + ? = -31 + ? + ?

Then I factored the 9 and 4.

9(x^2-4x+4) + 4(x^2+2x+1) = -31+36+4

9(x-2)^2 + 4(x-1)^2 = 9

Then I divided it all by 9 and got:

(x-2)^2 / 1 + 4(x-1)^2 / 9 = 1

Is this correct or did I mess up somewhere?

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Math - I am trying to find the standard form of this equation for an ellipse. ...
Math - Find the center, vertices, foci, and eccentricity of the ellipse. 9x^2 + ...
Math - Find the center, vertices, foci, and eccentricity of the ellipse. 9x^2 + ...
Pre-Cal - Find the standard form of the equation of the ellipse. (Remember ...
precal help - Find a Parabola with Vertex (3,1) Focus (4,1) Find the vertex of ...
PRECAL - Find a Parabola with Vertex (3,1) Focus (4,1) Find the vertex of 4y^2+...
math/Check! - a. An ellipse is formed by stretching the graph of x^2+ y^2=1 ...
someone please chek my math! - a. An ellipse is formed by stretching the graph ...
MATH/ Check? - Correct. what is pi The definition or the number? The number is 3...
Algebra-Please check work - I've reworked this and added on is any of it correct...

Search
Members