c2+3c−2c^2+3c-2c2+3c−2^2 = c2+3c−2c^2+3c-2c2+3c−2c2+3c−2c^2+3c-2c2+3c−2 = c^4 + 3c^3 - 2c^2 + 3c^3 + 9c^2 - 6c - 2c^2 - 6c + 4= c^4 + 6c^3 + 5c^2 - 12c + 4
c2+3c−2c^2+3c-2c2+3c−2^2 = c2+3c−2c^2+3c-2c2+3c−2c2+3c−2c^2+3c-2c2+3c−2 = c^4 + 3c^3 - 2c^2 + 3c^3 + 9c^2 - 6c - 2c^2 - 6c + 4
= c^4 + 6c^3 + 5c^2 - 12c + 4