1.

If S-= x^(2) + y^(2) + 2gx + 2fy + c= 0repre- sents a circle then show that the straight line lx + my + n = 0 (ii) meet the circle S = 0 in two points if g^(2)+f^(2)-c gt ((gl+mf-n)^(2))/((l^(2)+m^(2)))

Answer»


ANSWER :`G^(2) + f^(2) -c = ((gl+mf-n)^(2))/(L^(2)+m^(2))`


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