Thursday

March 26, 2015

March 26, 2015

Posted by **Anonymous** on Tuesday, August 26, 2008 at 6:21pm.

find the coordinates of the center, the foci, and the vertices of this ellipse.

9x^2+16y^2-18x+64y-71=0

9x^2-18x+16y^2+64y=71

9(x^2-2x)+16(y^2+4y)=71

9(x^2-2x+1)+16(y^2+4y+4)=71

- Math -
**bobpursley**, Tuesday, August 26, 2008 at 7:00pmThe last line is just wrong. You added 9 +64 to the left, and did nothing to the right. If you add things to one side, you have to add to the other.

- Math -
**Anonymous**, Tuesday, August 26, 2008 at 7:14pm9x^2 - 18x + 16y^2 + 64y = 71

9(x^2 - 2x) + 16(y^2 + 4y) = 71

9(x^2- 2x + 1) + 16(y^2 + 4y + 4) = 71 + 9 + 64

9(x - 1)^2 + 16(y + 2)^2 = 144

(x - 1)^2/16 + (y + 2)^2/9 = 1

centered at (1, -1), major axis length 8, minor axis length 6.

Vertices are at (5, -1) and (-3, -1).

- Math -
**shankeria**, Sunday, April 18, 2010 at 7:53pmIf the exterior angle of a regular polygon is 45o, then find the number of sides of the polygon

**Answer this Question**

**Related Questions**

algebra - Find the vertices and foci of this ellipse 4x^2+16y^2+64x+64y+256=0

Pre-calculus - For the ellipse with equation 5x^2+64y^2+30x+128y-211=0, find the...

Pre-Cal - Classify the conic and write the equation in standard form: (1) 9x^2...

math - clasifying conics 4xsquared=64-64ysquared 4x^2 = 64 - 64y^2 4x^2 + 64y^2...

Math 30 Pure - 9x^2+16y^2+64y+28=0 I am supposed to convert this to standard ...

Math - Find the vertices, center, asymptotes, and foci of the ellipse and sketch...

Algebra 2 - 9x²+4y²-18x+16y-11=0

algebra 2 - Graph the equation. Identify the vertices, co-vertices, and foci of ...

Precalc - Find the center and vertices of the ellipse. 4x^2 + 16y^2 - 64x - 32y...

math help urgent - what di di do wrong in this??? the question is: x-8y=18 -16x+...