The radius length of the circle with equation x^2 + y^2 + 2gx + 2fy + c = 0 is: A) c B) -c C) g^2 + f^2 - c D) √( g^2 + f^2 - c) E) g + f
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Originally Posted by Joker37 The radius length of the circle with equation x^2 + y^2 + 2gx + 2fy + c = 0 is: A) c B) -c C) g^2 + f^2 - c D) √( g^2 + f^2 - c) E) g + f Completeing squares $\displaystyle (x+g)^2 + (y+f)^2=?$
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