If (m,-5) is on a circle with center (2,-5) and radius 6, what is the value of m?

The equation used is the standard equation that has the form:
 (x - h) ^ 2 + (y - k) ^ 2 = r ^ 2.
 where h and k are the x and y coordinates of the center of the circle and r is the radius.
 Substituting values:
 (x - 2) ^ 2 + (y + 5) ^ 2 = 6 ^ 2.
 We substitute the point (m, -5) in the equation of the circumference:
 (m - 2) ^ 2 + (-5 + 5) ^ 2 = 6 ^ 2.
 Rewriting:
 (m - 2) ^ 2 + 0 = 6 ^ 2
 (m - 2) ^ 2 = 6 ^ 2
 (m - 2) = 6
 m = 6 + 2
 m = 8
 
 the value of m is:
 m = 8