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= k^2+2k + k +2 (2k + 3) /6
= 2k^3 + 3k^2 + 4k^2 + 6k + 2k^2 + 3k + 4k + 6 /6
= 2k^3 + 9k^2 + 13k + 6 /6
= 2k^3 + 9k^2 + 13k
2. (k+1) (k+2) (k+3)
= k^2 + 2k + k + 2 ( k+3)
= k^3 + 3k^2 + 2k^2 + 6k + k^2 + 3k + 2k + 6
= k^3 + 6k^2 + 11k + 6