The equation of a circle is in this form:

Where r is the radius and (h, k) is the center. You need to get your equation into this form by completing the square:

So this is a circle with radius sqrt(8) and center at (0, 2).

You probably mean divide by 2.2x^2+2y^2+4x-12y+10=0 yes, (remember to divide the equation by zero) why is a circle? How?

Can you figure out the rest for this one?

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