2 2*x - 50
2*x^2 - 1*50
1*(x + 5)*(x - 5)
(1*(x + 5))*(x - 5)
-50.0 + 2.0*x^2
/ 2\ 2*\-25 + x /
2*(-25 + x^2)
2*(-5 + x)*(5 + x)