2 2 s - r + 10*s + 25
s^2 - r^2 + 10*s + 25
1*(r + 5 + s)*(r + -5 - s)
(1*(r + (5 + s)))*(r - (5 - s))
-(-5 + r - s)*(5 + r + s)
25.0 + s^2 - r^2 + 10.0*s