Posted by **Ttt** on Thursday, October 27, 2011 at 3:18am.

Classify the conic section

4x^2+5y^2-16x-30y+41=0 as a circle, ellipse, hyperbola, or parabola?

- Math -
**drwls**, Thursday, October 27, 2011 at 4:20am
Ellipse

4(x^2 -4x +4) + 5(y^2 -6y +9) = -41 + 16 + 45

= 20

= 4(x-2)^2 + 5(y-3)^2

(x-2)^2/5 + (y-3)^2/4 = 1

- Math -
**Anonymous**, Thursday, October 27, 2011 at 10:07am
The sum of 16terms of an A.P IS -504,while the sum of its 9terms is -126. Find the sum of its 30terms

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