2 (2 - c) - c*(c + 4)
(2 - c)^2 - c*(c + 4)
4 - 8*c
1*(c - 1/2)
4.0*(1 - 0.5*c)^2 - c*(4.0 + c)
2 2 (2 - c) - c - 4*c
(2 - c)^2 - c^2 - 4*c