$\"\"$

The equation is " $\"\"$ ".

Compare the equation to $\"\"$ .

Then A = 4, B = $\"\"$ 3, C = 2, D = $\"\"$ 4, E = 0, F = $\"\"$ 2.

So $\"\"$

$\"\"$

Since $\"\"$ .

So the equation define an ellipse.

$\"\"$

The equation is ellipse.