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