2 k - 6*k + 9*k
k^2 - 6*k + 9*k при k = 3/2
k^2 - 6*k + 9*k
(3/2)^2 - 6*(3/2) + 9*(3/2)
(3/2)^2 - 6*3/2 + 9*3/2
27/4
2 k + 3*k
k^2 + 3.0*k
k*(3 + k)
2 k + 9*k - 6*k