According to the meaning of the question, the square of the distance from point to o is x? +y?
Is the square of the distance from a point to a (x-c)? +y?
∴(x? +y? )-[(x-c)? +y? ]=c
2xc-c? =c
x=(c+c? )÷2c
=( 1+c)/2
Three questions. Let the coordinates of two fixed points be a (-3,0), B (3 3,0) and point M (x, y).
(x+3)? +y? +(x-3)? +y? =26
2x? + 18+2y? =26
x? +y? =4