Weird Circle Equation (1 Viewer)

Heresy

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Here it is:

Find the coordinates of the centre and find the radius of a circle with an equation of:

x^2 + 8x + y^2 - 6y


I haven't seen a circle equation like this, so I am confused. Any response would be appreciated.
 

HeroWise

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You have to complete the square and you get centre (-4,3) and radius 5
 

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