Prove

Prove that k1 and k2 is the equations of two circles. Find the equation of the line that passes through the centers of these circles.

k1: x2+y2+2x+4y+1=0
k2: x2+y2-8x+6y+9=0

Result

p = (Correct answer is: p=x+5y+11=0) Wrong answer

Solution:

k1:x2+y2+2x+4y+1=0 k2:x2+y28x+6y+9=0  (xx0)2+(yy0)=r2  k1:(x+1)2+(y+2)=22 k2:(x4)2+(y+3)2=42  S1[1,2] r1=2 S2[4,3] r2=4  ax+by+c=0  a (1)+b (2)+c=0 a 4+b (3)+c=0 a=1  a+2bc=0 4a3b+c=0 a=1  a=1 b=5 c=11  p=x+5y+11=0



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