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put this solution on YOUR website!4x^2+y^2+8x-4y-28=0
Sort it out and factor the coefficient of x^2. Leave spaces in order to complete the square in the next steps:
To complete the square, you must take half of the x coefficient (Half of 2 is 1, and square which is 1. On the right side, however, you must add 4*1 which is 4. It should look like this:
Divide both sides by 36 to write this in standard form for an ellipse:
This is an ellipse, with center at (-1,2), with a "radius" of 3 in the x direction, and a "radius" of 6 in the y direction.
R^2
