(3c-1)^5 = C(5,0)(3c)^5(-1)^0 + C(5,1)(3c)^4(-1)^1 + C(5,2)(3c)^3(-1)^2 + C(5,3)(3c)^2(-1)^3 + C(5,4)(3c)^1(-1)^4 + C(5,5)(3c)^0(-1)^5
= 1(243c^5) + 5(81c^4)(-1) + 10(27c^3) + 10(9c^2)(-1) + 5(3c)(1) + 1(-1)
= 243c^5 - 405c^4 + 270c^3 - 90c^2 + 15c - 1
(3c-1)^5 = C(5,0)(3c)^5(-1)^0 + C(5,1)(3c)^4(-1)^1 + C(5,2)(3c)^3(-1)^2 + C(5,3)(3c)^2(-1)^3 + C(5,4)(3c)^1(-1)^4 + C(5,5)(3c)^0(-1)^5
= 1(243c^5) + 5(81c^4)(-1) + 10(27c^3) + 10(9c^2)(-1) + 5(3c)(1) + 1(-1)
= 243c^5 - 405c^4 + 270c^3 - 90c^2 + 15c - 1