How do I find the radius and center of the circle x^2 + 4x + y^2 = 5?
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Complete the square. $\displaystyle x^{2}+4x+4=(x+2)^{2}$ $\displaystyle (x+2)^{2}+(y-0)^{2}=9$ The circle is centered at (-2,0) and has radius 3. See?.
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