2 (2 + 3*c)
(2 + 3*c)^2 при c = 3/2
(2 + 3*c)^2
(2 + 3*(3/2))^2
(2 + 3*3/2)^2
169/4
(2.0 + 3.0*c)^2
2 4 + 9*c + 12*c